Hi, you should start out by knowing one thingI am epic, hail me. Welcome to Blockland :3
Here are some tips for forums
Don't post anything you make in decal section unless it is pretty good.
Same goes for add ons. If you do those 2 things you will become a "Furdle" which is someone who released everything they made even though it sucked. and such. I personally had no problems with Furdle but his habits annoyed me.
Don't use emotes in ways like this: That is win, here, have a cooke

. or LOLZ HAR AM A

HURAY AND GET IT BEFOR THE

MONSTAR GETS IT OR UL BE A

EATIN

PLEAYIN A

That last one is probably one of the worst things on the forums you can possibly do. People will just hate you.
And don't say "First post" if you post first in threads, times have changed and people don't like it anymore.
Ingame
Don't join a server and ask for admin or any special privileges unless you know the person really well. (and even if you do know them, try not to ask unless it is necessary.)
Um... can't think of much more right now.