Hey GeGreene! You're most certainly not the first person to discover the site from tvtropes (in fact, it's a pretty common way for a lot of people to find the site), and you certainly won't be the last.
I think one of the best parts about this site is that it helps people improve their writing abilities. A lot of members on this site have really developed as writers from their experience with this kind of collaborative community.
If you haven't already, make a sandbox page, get feedback in the draft and critique forums when you're ready for some critique, and throw it past the IRC Chat for some more feedback. The IRC (chatroom) is a great place to get to know the members of the site, hang out, and of course, get feedback on drafts.
Welcome to the site! Hope to see some great work out of you.