PPC newbie alert! (Me that is

)
So, I once got banned by google adwords in my FIRST campaign. OUCH! and before I create another one, I was just wondering if you guys have any tips to prevent from being banned in the first place.
I know I had done wrong before but what pisses me off is that Google doesn't give the reason for the ban. Well, I guess I have to figure it out by myself.
Anyhow, any tips?