Hello and welcome welcome to the fabulous world of kind of a sport maybe? We're happy to have you.
Without going too deep into this I can see how you can get overwhelmed by InfiniteDiscs and the like. There are a lot of manufacturers and a lot of molds and plastics from each of those to keep straight. I'm going to throw a basic concept list together below to point you in a starting direction and if you have any specifics post back, dm, or text me. I'm happy to help.
#1 -- Equipment
--Get yourself a starter bag or something. Doesn't matter what it is, just something that can hold 6-10 discs and a water bottle (read:beer) and a towel. I started played when I was younger and said "look at those assholes who carry bags, I've got 3 discs, what more could I need". I play tournaments now. I have a backback that holds 18 + 4 in the top, a rosin bag, towels, hydroflasks and a stool. So I'm that asshole. But you need something simple at this point. Depending on how cost shapes up, Dynamic Discs makes a couple of great entry level bags, I carried a Patriot for a while before upgrading to my backpack.
-- Shoes are up to you. I play in Solomon trail runner style shoes. Waterproof but breathable. But I've played in tennis shoes plenty. I just don't like walking around in wet socks for most of a round because the course is soggy or has dew in the morning.
#2 -- Discs
-- Every disc has 3 things you'll want to pay attention to. Disc Type (Distance, Fairway, Mid, Putter), Plastic Type (Will outline below), and Stability (how willing a disc is to 'turn over' when thrown flat to move right (on a RHBH drive) through the air, giving you a big "S" turn for maximum distance.
-- Disc Type is self explanatory. If you want to enjoy the game and get better at it, DO NOT buy high speed distance drivers yet. It's akin to a 25 handicapper buying blades. You don't have the arm speed or the form to throw these correctly yet, and will frustrate yourself greatly trying to do so. Your set that you have is the starter for a reason. The Leopard is a great driver for new players (I throw a Leopard3 which is a flatter more overstable version of yours). Buy putters, mids, and low speed fairway drivers and learn to throw them. Try throwing hyzer to flat off the tees with putters. You'll throw your drivers so much farther and more accurately if you can control lower speed. You'll be a better player and have more fun if you learn the proper form with lower speed discs and work your way up as you improve.
-- Plastic Type: Every manufactuer has their own names for these but Innova set the standard so I'll use those to start.
DX Plastic is your cheapest base plastic. I don't care for it but it has it's uses. DX plastic "beats in" quickly, meaning that the discs naturally lose stability as you throw them and hit trees, baskets, and the ground. I find the inconsistency difficult, but they are a great starting point for getting into the game.
Champion Plastic is a premium plastic that resists beat in and tends to cause discs to be more overstable. Champion reacts to weather, it can be hard to grip in the rain and painful (for me) to throw when it's cold outside.
Star Plastic combines some of the best attributes of other types. It's stable but not overly so, provides a good mix of grip and feel, and is incredibly resilient. Those are your main 3. There are others but they tend to be fringe stuff (GStar: a 'gummier' version of Star, more understable. Ecostar: recycled plastic content. StarLite: lighter versions targeted for women and children to be easier to throw.) I'd stick to the basics until you're comfortable.
-- Stability: This is probably the most important concept and barrier to "why can everyone on youtube throw so far". If you throw Right Hand Back Hand, as in pulling the disc across your body with your right foot as your plant forward foot when you throw, a disc that is OVERSTABLE will have a tendency to go straightish, then as the disc loses speed, move hard from right to left to the ground, often skipping considerable distance when landing. A NEUTRAL disc will want to go straight or possibly move slightly from left to right when thrown, then finish softer, but still right to left at the end of flight. An UNDERSTABLE disc will have the tendency to move left to right immediately and continue on that path through the flight, often landing right or straight of the start of the throw. To make it really fun, this is all reversed if you throw Right Hand Forehand, sometimes called "flick".
--If you're interested in what the numbers on the disc mean 1/2/3/4 -- 1: Speed- The arm speed needed to generate a designed flight of that disc. 2: Glide - How far the disc tends to glide out. 3: Turn -- This is stability. The lower this number, the more understable the disc and the more likely it is to "turn over" out of your hand. 4: Fade -- The other stability number, the higher this is, the harder the disc will want to return to ground to the left at the end of flight.
All of those are effected by the angle in which you throw the disc. ( / HYZER) -- ( - NEUTRAL) -- ( \ ANHYZER). For example, you can get an overstable disc to act more understable by releasing it on an Anhyzer angle. Conversely, you can throw a neutral or understable disc on a hyzer angle and perform the single most fun act in Disc Golf, the "Hyzerflip". Where the disc comes out at an angle, then just "snaps" to flat and rides that dead straight line for a nice long drive.
Youtube is your friend. Check out JomezPro and CentralCoast Disc Golf. Danny Lindhal does great form and training videos for beginners. Dave Feldberg does great clinic videos.
Looking back I know I got longwinded here. You really can't go wrong at the beginning as long as you stay away from throwing 13 speed overstable distance drivers. All the companies make great plastic. I throw a mix of Discmania, Innova, Dynamic, MVP, and Westside. I find a mold I like and I mess around with different plastics and stages of wear. A few ideas of discs for beginners here if you're looking to add specifics. The starter packs are great too especially to have lying around to play with friends.
Putters: All feel here. Some are beaded, some aren't. Putting is entirely feel. I'd suggest finding a feel you like and using it across the board for short drives and putts.
- Dynamic: Judge/Warden/Crown
- Discraft: Magnet/Putt-r
- Innova/Discmania: Aviar, P2, P3, Dart, Rhyno
Mids:
DD Truth, Discraft Buzzz/BuzzzSS/BuzzzOS, Innova Shark/Mako/Mako3 and Roc/Roc3, Westside Pine
Fairways:
Innova Teebird/Teebird3, Innova Leopard, Innova Valykrie, DD Explorer, Discmania FD/FD2
https://www.marshallstreetdiscgolf.com/flightguide