The size of your cab determines what kind of light you can have. Definitely don't germ anything until you get a light in there and make sure temperature is okay.

Seedling stage is when it's gonna be rough on the plants if you're not there very often. A small pot, with airy soil, will dry fairly quick. Also, since you're in a cab, the first few weeks of flowering is something to worry about since the plant stretches so much. It would suck to come back after a few days and find your plant has grown into the light and is getting burnt.