I start them in solo cups and wait to transplant 10 days after germinating, and transplant into final 5 gallon pots. You will be good in the first 10 days on only water as nutes will shock your plants. Try out pro mix hp with perlite. My nutes i use are grow, micro and bloom from advanced nutrients, bud ignitor, bud factor x, nirvana and bug bud. Once auto has shown sex at about the 3rd week you have about a week and a half until it starts flowering on its own. First week and a half i use bud ignitor, my base nutrients and bud factor x.