Really, picking a workout is a 'small' detail. The large details are the intensity that is put into a program, the amount of rest for recovery, quality food and/or supplimentation and nutritional balance.
Figure out precisely what your immediate goal is, find a proven workout that works towards that goal and then give it your all.
Can't really go wrong with 5*5... Though to be honest, I'd just do a 4-way (whether you want a 1/week frequency or restart the cycle every 5-6 days is up to you...) and make sure I got stronger in the hypertrophy zone on every exercise, every session. Upon stalling on an exercise, switch it out for another one which hits the same target area... And there you have it.
Don't think diet needs to be explained... So there.