Having followed Westside principles since the mid-90's, I've got a decent grasp on how the system works. The way Louie explains it, can be very convoluted and tough to grasp.
Instead of lifting light weights for higher reps, you're going to work up to lifting heavy weights on every maximum effort day. Instead of sticking with conventional lifts like the flat bench, the squat or deadlift, you're going to utilize exercises that are LIKE the squat/bench/deadlift but they differ somehow.
For example, instead of doing flat bench you might do floor press, board presses, pin presses. You might use different grips, different types of bars...Each one of these special exercises you do, you establish a PERSONAL RECORD and you try to BEAT that record either in reps or weight. Usually it's as simple as warming up and adding plates until you get in that 90% region and you try to hit 3 lifts up there.
Same goes for the squat/deadlift day. Instead of doing normal squats you can do box squats from different heights, you can use different bars, you can do front squats or use a manta-ray, zercher squats, goodmornings.
For a beginner, I recommend sticking with a particular exercise for 2-3 weeks before switching. The Westside guys rotate every week now. Their training is very dynamic in that it is constantly evolving. For a newcomer, in order to wrap their head around how this training works, I think it's important to choose a special exercise and try to advance in that lift over 2-3 weeks before switching to a new special exercise. Do this for several 12 week cycles and then you might cut down to 2 weeks.
The dynamic work is just a matter of using ROUGHLY 50% of your max for 8-12 sets of doubles in the squat and 8-12 sets of triples in the bench. If the weight moves too fast, add a little, if it moves too slow, remove a little. Watch some Youtube videos of the actual westside guys to see how fast dynamic work should be.
To wrap up each workout...if you're talking bench, you want to hammer all the supporting muscle groups. Triceps, lats, delts. Squat/Deadlift same deal, strengthen the hamstrings, glutes, lower back, hips, abs, quads, calves...
I truly believe the Westside way is one of the best in the world...it's not a cookie-cutter system where you calculate percentages and everyone on the program is doing the same thing. If you take 2 guys and you both have them do 5/3/1...one of them is going to make better gains than the other, guaranteed...because the training system isn't specific enough.
Now, the BIGGEST drawback to Westside is this...
You aren't going to maximize your results if you're not hitting exercises that strengthen YOUR WEAKNESSES.
What are your weaknesses? I don't know. Do you? I have trouble identifying my own weaknesses...I just treat myself like I'm weak all over. I know there are some areas that can be improved but, if you're in the presence of someone who knows their shit, where they can say "you have weak hips, you need to do X,Y, Z for the next 12 weeks" and you follow the advice, you'll make tremendous gains in those 12 weeks.
If you don't have people like this who can help you...you're just going to be choosing special exercises and accessory work without any rhyme or reason. You'll gain some strength but it will probably be modest. You'll probably think that the Westside approach is garbage and give up on it.
my two cents.