After a quick google, I found these links. The first two are for beginners, as the title says. This tutorial is for the original Gameboy and this tutorial is for the Gameboy advanced. This link may be relevant for you but I haven't looked into it too much.
I hope this helps!
After a quick google, I found these links. The first two are for beginners, as the title says. This tutorial is for the original Gameboy and this tutorial is for the Gameboy advanced. This link may be relevant for you but I haven't looked into it too much.
I hope this helps!