A test rig - if you want to test the result without soldering.
Follow this handy guide for how to put the top side together. Note that the markings on the board are not great for locating where to put the components, so I recommend loading up the design in kicad and printing out something that shows where all the components should go. Once the top side is done, you can test the USB, CPU, motion and three of the FETs before continuing. Using a skillet will probably not work for the bottom side though, instead you need to use a hot-air solder station to melt the solder after the components have been placed.