You did right planting your beans in the pot u intend to do your grow in, at first water around your seedlings till they gain size then you can water whole pot, yea u can transplant autoflowers but it stresses them and they can dwarf out, baby them along till they gain size, a few times a day take ur index finger and move your seedlings back and forth this wont hurt them and make your mainstem harden faster. Ps did u add pearlite?