Ah finally, a thread for me to ask these stuff:

1. How can I convert .png or .jpg files into .j2t files?
2. What's the size of a tileset? What about the size of a tile?
3. What program do you use for making tilesets (drawing, coloring etc.)?
4. Regarding the same program, is there any way to make grids depending on the size of a tile?
5. Is there like a certain number of colors you can use for the tileset? I guess that's called a "palette".

I'm far away from being an artist but who knows, maybe I'll use this information someday.