Rules of Thumb
Keep Organized
Read The Laws!
I think the best rule of thumb for anywhere you spawn is to make sure you read the laws! If they aren't available (usually on the ground) then don't be afraid to ask around.
Reading the laws you can do by clicking on 'objects', which lists all objects on the ground on that location, including notes, and then on the eye-buttons to read the specific notes that you see. Most locations with at least a few people living there will have a note with general rules or laws. But, not all locations have laws.
There are no game rules stating you must follow the laws of your society. But remember, if you choose to be someone who breaks the law, be sure you can get away with it, unless you want to face the consequences.
Keep It Original!
Another good idea is to make your characters as original as possible. Using outside names of people and organizations is generally frowned upon by serious roleplayers. It shows a lack of imagination which makes Cantr so great. Even if your character does not assume the aspecs of the reallife person your character will be taken much less seriously then a character with an orginal name.
Out Of Character \ In Character
OOC is the tag most use in game to indicate that the "player" uses to convey a message from their point of view rather than the characters. This is generally frowned upon in the game but is still used in certain cases. If you *must* speak OOC, it's preferred you do so in a whisper.