Movement

Hey I have been doing flash for a couple of months now (3) and I have decided to make a game…I have checked out the tutorials here but they arent quite what Im looking for.

I want to make a side scrolling platformer…like sonic or mario, ect ect.

can anyone help me out?..I also have a problem when making the ground…I can make 1 base that the character (currenty a circle) wont fall through…but if I make another 1 or 2 platforms in the ‘sky’ the circle falls through.

and lastly I dont get how to make the game accually ‘scroll’ when he walks…I have tryed some stuff but it doesnt come out quite the way I want it.

thanks in advance.