New to taking the pill

Tye
So I'm currently on my 3rd week of my very 1st pack of pills, I've never taken birth control before so I was wondering, when do I start my next pack? I know some people skip the placebo pills and just let their period come, but do i still have to wait 7days before starting the next pack even if I don't take the placebo pills and my period doesn't last 7days?