I've been studying pascal in school for a semester and i've made a couple games in the console/ASCII

I've made a game where a computer player chases you
I've made a pong clone (Was easy for me)
I've half-made space invaders (Got the shooting and the enemy)

So a couple of questions,
1) When am I ready to learn a graphics library or whatever you call it? Because the restrictions of the console are really getting to me.
2) Should I be able to make a pac-man clone?
3) What is a popular graphics library?
4) This site confuses, is this the right board to post this on?