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Seriously you're better off asking someone who currently hacks. I guess one thing to keep in mind is to make your ROM hack unique somehow. Ordinary hacks don't get much attention.
Uh, I haven't done ROM Hacking for years. Honestly you're best off asking someone else. Try read some of the guides in the ROM Hacking section and ask some experienced ROM Hackers for tips.
If you want a nice and simple way to insert tiles, then this tutorial is really helpful. It was the one which taught me how to insert tiles so I'm sure it will help you out as well.