Help! First time grower in SoCal

Hello everyone I have been using this site for a while and love all the feedback and questions being answered. However, this summer is my first time growing alone and I have placed several clones in 3 gallon pots in my backyard and am looking for help. I currently have all the clones in organic ocean fox farms soil and they're all about 6-8 inches tall and have been in the soil for about two weeks now. I was wondering whether or not I should start giving them nutrients like a 6-4-4 concentration and how long I should do it for before they start flowering and change the nutrients.. My only concern is that I go back to college September 1st and want to make sure my clones have enough time to be harvested. All of the clones are heavy indicas and I was just looking for any kind of recommendation/help on the schedule and caring to my clones. Thanks for your time!