Welcome! Welcome to City Seven... I mean Blockland Forums. Don't mind the above being silly, it's for good fun - better than some other things that happen here.
I can't think of a creative welcome now, so I'll give you a list of guidelines, as much as I can think of anyway.
-Don't make Roblox forum-level pointless threads like "I shoved a hotdog up my mouth". We're not that kind of forum. Then again I'm not sure what kind we are.
-Besides the above, try to have fun. You don't necessarily need to make it. I've made few threads myself.
-Irony and sarcasm await at every step.
-Don't be a richard. Not a major one at the very least.
-Look, but don't post at the Drama subforum. Despite the name, it is not "drama for the sake of drama". It's a board to report and discuss problematic Blockland users to the community (and eventually Badspot if it's of a bannable offense). The names in the drama are probably worth avoiding, but do read the threads to see for yourself. But, don't post until you know what you're talking about.
About the last point, people are telling new users to stay away from Drama entirely, but that's because new users tend to crap up Drama with minor incidents or spam.
Have fun in the BLF!