Hey there Dragonite - a huge welcome to PokeCommunity!
So this is your first time on a forum, I see? Well, the first suggestion I can give is not to stress or worry too much about things here. I know some new members get worried they'll post a thread in the wrong place or make a mistake in general, but in the end we all make errors and it's totally fine! One of my first forum warnings (not on PC though) was for having a signature that breached the limit, but after some time passed I started getting the hang of things and learned to understand a forum's rules more, so it's all right (as long as you're not out to break the rules, of course). It may sound like something that's common sense, but you'd be surprised with how many people worry about that. Other than that... well, just explore for yourself and see! There are plenty of things on a community of this size, meaning there are that many more people to help you out if you need it. We have an entire section dedicated to questions/feedback called
Questions & Feedback, too!
I'll second our awesome regulars in suggesting the Battle Center and Challenges sections for you if that's what you're into. They're both rather popular and growing parts of the forum so being part of that is a wonderful choice! Though our battlers mostly do battle through our official Pokemon Showdown server, so setting up your favorite team is that much easier. I've always wanted to try actual WiFi battling but my internet is wired so that won't be possible (at least not for a while). D:
So yeah, have a blast okay! See you around!