Welcome to the wiki!
Hello! I'll spare you the generic greeting (found here) and welcome you aboard in person. You'll probably run into some resistance from other members if you try to use your account mostly for socializing, though I would understand why you would do that given the recent DDoS attacks on other Smash websites. There is a community page that can give you some direction as well as a Smash Bros. Reddit community that is still functional not listed in the article.
I hope you find something that interests you to write about - there's always information to share and incomplete or wanted pages pages on common things in Smash Bros. Maybe you'll make a few the rest of us didn't think of!
If you're new to wikis in general, there can be a lot of information to take it. I suggest reading some of community suggestions and getting a feel for writing wiki pages with the sandbox. Don't worry too much about mistakes on your first few edits on actual wiki pages, most users will assume you have good intentions.