Ill be honest. Those are not the best choices for pc growing. The church especially since its a huge outdoor strain. You would get much better luck from an autoflowering strain such as lowryder. You will definitely need to train them if you are going to try and make it work.

An Overview of Cannabis Training (ScrOG, SoG, FIM, Supercrop, LST, etc.) - Marijuana Cultivation - Growery Message Board
That link has a ton of training methods and applications.

Expect them to double in size or more after you flip to 12/12.

Goodluck and keep growing!