First off, introduce yourself:
http://forums.tigsource.com/index.php?topic=45.0 around these parts it's considered a sort of basic politeness.
Then, talk about your ideas, contribute to threads, start some relevant ones of your own. If you're worried about people stealing your 'best stuff' then by all means hold that back, but unless you put some effort into convincing people you're worth working with you wont get very far, 'sell' yourself, walk the walk, -insert other relevant clichés here-.
Oh, and also, a big long list of "things that must be true for me to be interested in working with you" isn't going to do you any favours. Best case it'll cut out some awesome potential people, worst case it'll put the people that do fit the mold off too.
Anyway, that all probably comes across a bit negative, but it's really not meant to be. Good luck with it
![Coffee](https://forums.tigsource.com/Smileys/derek/coffee-toast.gif)