But before we get to logistics, let’s prototype. You either are starting with a set of CubeSat or TubeSat reference board schematics, or you are designing your own setup. In both cases, you will want to test each board in isolation before committing to your final build.
I recommend that you use a breadboard or prototype kit for your main processor (again, often Arduino or BasicX-24). These kits include interface software and the programming API. You want to prototype your processor layout, program it in your lab, and then later move it to your flight-ready PCB.