Hi, welcome to the arena!
So great to welcome another multi-generation fan. I grew up in time to know about G1 when it was new, but i didn't catch the bug until I got hooked on G4 not long ago, and it was slippery slope to the earlier generations. I personally like ponies best when some from the different generations are all mixed up together.
There's a FiM subforum for all your G4 needs, and everything else can be found in the Pony Corral, and there are forums for Arts n Crafts, Customs, and a Pony Brag forum where we like to share pics of our ponies and we'd love to see yours if you feel like sharing them with us there. Feel free to have a look around, ask questions, start threads and all that good stuff.
I hope you enjoy your pony experience here!