As a fan of frankensteining/modifying, my biggest suggestion is start by just playing it for a few months. Get really familiar with what you like and dislike about it. Leave the stuff you like alone and change the stuff you don't like. That's my practical advice.
My impractical advice is, for $100, if you completely destroy it by accident, do you care? If not, go crazy. Any wild idea you can think of just to see what it would be like. Experiment with different pickups and preamps and strings. Experiment with refinishing. Try different bridge styles. Experiment with whatever sparks your curiosity. And then if the experiment results in something you don't like, it's still a successful experiment because you learned you don't like that mod, and then move on to the next mod.