Here's my arguement for focusing more on teh core lifts.
Lets say you're a beginner with 15 inch biceps.
The basic function of the bicep is to assist your back in pulling. No matter how many curls you do in an attempt to get 20 inch guns, it's just not going to happen if your back, and the rest of your body can support that kind of size.
Now look at your shoulders.
They basically push stuff up. If your abs, back, hips and legs aren't thick enough and strong enough to stabilize heavier loads overhead, you won't be able to move the kind of weights that will give you cannon ball delts.
So, while the core movements aren't the end-all-be-all of lifting and muscle growth, I feel they're way under utilized by 90% of the population (by the way, I just made up that statistic, but I bet its not too far off).
So I say, start off for a few months with just the core lifts, keep your workouts to under an hour, eat like a horse, do more research along the way, and you'll come along just fine.
Good luck bro!