Game Characters and other stuff

hey everyone…

I’m new to this site and i started trying to program stuff onto my TI 83 plus calc…

I’ve created a couple games like menu games… and i also created a game where you move around a matrix made level(8 by 16) and collect stars…

But i can only make my guy look like a character on the calc like X, 0, I or something like that… How do i draw a character or design my own???

Also how do i create a level thats more realistic then a matrix made one…and how do i make it so when you reach the edge of the screen it would scroll over and you could go even further??

Last how do i make Bad guys move and attack and stuff like that???

I’d really appreciate if anyone could help me out with these things !!!