Yep, check out the rules towards the top of the page.
As far as the classifieds go, you must be here for at least 30 days and have at least 20 posts. They still review your posts (or so the rules state), so don't just post-whore it up and rack up 40 posts all saying "lol".
Still, check out the rules, see what's allowed, see what's not, and welcome to the club! There are some pretty level heads here, some perverts, some weirdos, and some that words cannot describe. So prepare to discuss subjects completely unrelated from guns.