Bro'! welcome the wonderfull world of Bodybuilding! As we speak I am taking a day off training due to excessive soreness from a monster leg workout.
I think Arnold summed up the best approach I've heard in all my years of training.
"Instinctive training is the best method of growth....the only problem is it takes years to learn exactly what your body is telling you!"
Stick to the fundamentals. Train hard and brief to build the size required for competition. Rest between every other day. Eat a balanced high
protein diet.
I never allow a workout to go beyond 1hr EVER!! Yet Neither do i sit on the equipment between sets and chat about woman and how much beer i consumed last night. I recomend Intensity over duration.
By not training over and hour there is less chance your going to become overtrained.
Brief,intense, and strict in form.
Best of luck Bro' and post some of your photos when you compete.