Gonna answer to the questions I know.
1 -
http://forum.toribash.com/showthread.php?t=214194 <- found out this thread on FAQ by Trails.
2 - An infraction is when you don't follow certain forum rules. If you have 'x' number of infractions pilled up, you'll get a ban.
3 - When you receive a warning, you just need to don't make the mistake you've done again. A warning is given when you broke any forum rule and you get advertised for that. Now if you continue doing the same thing that isn't allowed over and over again, you'll receive an infraction. Consider: Warning as your salvation to don't receive an Infraction.
4 - There's many types of Ban. Simple ban with a lift date, Permanent ban and IP ban. (I don't know if there's more)
The simple ban is when your account is banned due several break of rules or certain amount of infractions. During ban, you cannot log at that account to post, etc.
Permanent ban is caused by the same reasons of the simple ban or more serious infringements you've committed but here your account is banned forever with none lift date. Can be lifted by admins but in very very extraordinary special cases.
IP Ban is when you're banned by your IP and you can't even access to forums, In-game and such. You'll receive one of this only if you do pretty bad things.
Edit: Added answer to first question.
Last edited by Hayz; Jul 20, 2011 at 02:53 PM.