Pen to Paper graphics or assets?

Hi

I didn’t really know where to put this, but its about graphics so I chose to stick it here.

What would be the best way to import graphics into my game? Shall I use assets which are already around or shall I create my own, and when i say create my own should I get one of them tablet things so I can draw on it and it appears on my screen, or pencil and paper then add colour and then scan in the graphics I do on paper and use them?

Im just gathering information before I start on a game, My idea is a top down rpg. Got some great ideas already in my head for it. If anyone ever played Zombies online by gunshine.net, on facebook thats the kind of idea im going for.