Pen to Paper graphics or assets?


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, on facebook thats the kind of idea im going for.