I agree that, it's what works best for you. I have collected many things that help me along with my builds.
First off, get yourself a good Exacto-type knife with replacement blades. Sandpaper, in all types of grit. I buy mine from the local department store in big sheets. Emery boards! These are found in the ladies cosmetic area. Just like sandpaper on a stick
While your there, get a good pair of tweezers and a small metal nail file also.
As for the airbrush, this has come up countless times. In my opinion, I think it is needed. It does take some practice to get the control and feel but, I would never go back to spraying color from a spray can. Cleanup on some can be a real pain but, the results are worth it (to me anyway)
Good Luck to you and Welcome to the forums!