You actually need very little after a good spoke wrench. A stand is nice, but you can hang the bike by its seat and use the brake blocks just as well. I raced on wheels I built that way. Many advocate getting very expensive Park and the like stands. They pay their way IF your time is worth money and you build a lot of wheels. I've been using a $30 stand and an $8 dishing tool for 30 years and have ridden virtually every mile on wheels off that stand.

To use the bike itself as a truing stand. loosen the brake bolt a little and rotate the caliper so that the shoe is almost touching the rim. Stand right in front or back of the bike so you can see that gap, then adjust the spokes to make that gap constant, gradually moving the rim until it just touches as you spin the wheel a full circle. For roundness, tape or rubber band a pencil to the forks or seatstays in similar manner. These principal are exactly what the best stands do. They just make the setting up faster.

Ben