There is a world of options out there with what to do to your car, and no two cars are alike. Personally, having been new to supras and this forum myself once (like everyone here), I'd recommend these:
1) read the sticky's first. there's a lot of info in them about how to maneuver the forums and how/what to ask.
2) read. a lot and on every topic. I've been on this forum for a few years now and I still spend the majority of the time I'm here reading and learning.
3) search for things you're interested in. Many of the guys on here are very well educated and have probably addressed pretty much anything you can think of. If your searches don't find what you're looking for, put a new thread out there and they'll take care of you.
And welcome to the forum!