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A nipple driver can be made out of any old screwdriver, as for the truing stand you don't necessarily need a professional one to build a wheel as long as you're happy to accept the wheel won't be up to the same (very high) standards. A nipple driver drill bit is very nice to have though if you plan to build more wheels, imo. If you are unsure about the results you can take it to your lbs for the final adjustments
With the wheel building process itself, at the moment I am watching videos on youtube and reading some Sheldon Brown to educate myself. Some builders are using spoke prep for instance, and have the bespoke tools for wheel building such as nipple drivers, wrenches and obviously a truing stand.
My build would very much be ghetto and not have a truing stand, but is it still worth getting a nipple driver and using spoke prep? I don't want to waste the quality of my parts with the poor quality of my build!