To keep it simple, when you aren't planning for a contest, it's a good idea to keep the reps up to build muscle. When you set up a plan to peak for a contest, start increasing bar weight and decreasing reps.
When you aren't on a peaking cycle, go ahead and do your bodybuilding stuff but you MUST incorporate the three main lifts.
A good approach would be similar to Westside's format from the perspective of order of exercises and not necessarily methods. For instance, when you bench press; do the competition bench set up to start and get in a good workout w/ that. Make the next exercise a variation of that: maybe close grip, wide grip or incline for reps. Then work some exercises to enhance your weaknesses. Maybe your triceps need some extra work or your pecs, delts, upper back, biceps, forearms.
The key is: you MUST put in the majority of the work on the main lift. Don't kill yourself doing the bodybuilding work. It's only there to assist, not dominate.
You could work this range back and forth on the main lifts:
Week 1 Bench sets of 10 reps / Squat and DL sets of 8 reps
Week 2 Bench sets of 8 reps / Squat and DL sets of 6 reps
Week 3 Bench sets of 6 reps / Squat and DL sets of 5 reps
This would be if you aren't planning a contest.
If you plan for a contest, a simple peaking cycle might look like this:
Week 1 50% for 1-2 sets of 10
Week 2 55% for 1 set of 10
Week 3 60% for 1-2 sets of 8
Week 4 65% for 1 set of 8
Week 5 70% for 1 set of 5
Week 6 75% for 1 set of 5
Week 7 80% for 1 set of 3
Week 8 85% for 1 set of 2
Week 9 90% for 1 set of 1
Week 10 50% for 3x5 or take the week off before the contest.
The percentages can be based on your last contest or current max.
These are all just examples and not carved in stone. It's a simple approach that has worked in the past and should help you hone out your own routine over time on what works and what doesn't.