Where could I find some refinishing and dent repairing tutorials? I don't necessary want to refinish the entire bass, I just wanna patch up some scratches. Would this be ideal?
There are dents. And then there are scratches. The materials and methods are different for each. Finish repairs are dependent on the original finish. It is also dependent on the desired result. Sometimes the techniques are both employed in the same repair.
Dan Erlewine's Guide to Repair is a good place to start. Furniture repair manuals are good sources for information on steaming out dents.
The most important thing is to practice the chosen techniques on scrap.
If it's black or has a clearcoat, eliminating scratches is pretty easy. Anything else and you're just better off buying a bass without scratches. I've had success using clear nail polish, and black nail polish. Matching colors is nearly impossible.