Yes.. A7 has lite-C ^^
Uhm.. first of all.. Think about a concept for your game.. RPG, Shooter, Adventure, Platform game..etc
After that. Write a Storyline/Plot, so you get a fix string you can code on.
At least, think of graphics and Sounds, and the way you wanna bring them into your game..
here, with help of EvilSOB and a freind, i plan a RPG in Rpg-maker XP graphics ( tile based mapping ):
Rpg-maker XP ( here we do mapping, and making a Datafile via RGSS ):
3DGS A7. Reading out the Datafile via lite-C ( fat THX to EvilSOB ), TILE by TILE mapped:
like you see.. With an idea and some good friends.. you can bring every 2D oncept into 3DGS.
Very importend is for you to learn:
Panels and how to use them.
Media syntax
basics of function and action coding
Everything like c_move, entity ..etc.. you can forget here..