1 - Act like you know stuff on multiplayer, dont scream in the mic "LOLOLOLLL I MAID A BIG CANIN LOLOLOLOLOLOL".
2 - Use grammar in text chat, like I am right now.
3 - Get plenty of mods, or else it will probably take a few hours to load. I'd know.
4 - Avoid multiplayer until you figure out some of the main functions of the games and your mods, once you can build a small house or a wire contraption, you're good for multiplayer.
(Note, these are the rules I follow, you don't have to do this.)
PS If someone blames you for deleting something, then say "No I didn't" repetitively in the mic or text chat, they'll leave you alone.
Happy gmoding :D
PSS, don't be a mingebag :p