Try to behave well and you won't get banned. And a permanent ban can only result from a major offense. 2 warnings don't mean you leave PG or make duplicate account. In fact, making duplicate accounts is a serious offense here.
Just behave well and it'd go well. And in case you do get banned, I don't think it'd be a long one. First bans aren't long ones unless the offense is something huge. Have a look at the rules.
About the game engine, what is your programming skill level? In which languages are you fluent? C++, C#?