Brand new to AoS but hooked already. Following a random conversation about D&D and not playing since being a teenager, and missing a lot, I went and bought a Soul Wars set intending to be Stormcast Eternals, but found the Nighthaunt fun to build and paint and went for them. Played against an experience bud (WH40K) who is newish to AoS with a Khorne army and had mixed success. Decided this game is for me so I want a second (and eventually one from each order) army, and Seraphon is the one that floats my inner Mosasaurus. So here I am.
Welcome to Jurassic Park!!! You have chosen well. Lizardmen in any edition is a lot of fun to play. Make sure you get your appropriate allocation of dinosaurs! Take a good look around the forum, there are a lot of different threads covering tactics, painting and just general chat. Each area has a lot of friendly people that will answer any questions (believe me I have asked a LOT and never fail to get a nice response). Enjoy!
What @Scalenex said. Don't be afraid to ask for any doubt you may have. In the subforum dedicated to AoS, you'll find plenty of good stuff.