Some of what you will need depends on what kind of Dob you intend to build.

If you build a Dob like John Dobson did with Sonotube and plywood you need fewer tools than if you build one like the type in the Kriege book.

The more sophisticated designs generally (though not necessarily) require more wood working tools.

Also, you may be surprised to find out how many of your neighbors and/or family members have nice tools sitting around waiting for you to borrow them.