If you want to know the absolute minimum tool set that will get you by, I built my 10" dob using nothing more than a jigsaw, a screwdriver, and a hand power drill. I built it in about three weekends on the front porch of an apartment.

It's workable and sturdy, but a long way from "craftsmanship".

The next most important tool to get, if I was going to build another one out of wood, would be a router, and a workbench.