Wouldn't it be easier to achieve your goal for size faster if from the beginning, you already train for size?
I think the idea is: not really, no.
When you are a beginner almost anything represents an adaptive stimulus. As a beginner I've gained muscle mass doing olympic lifts in the 1-3 rep range, for instance. I've also gained muscular endurance doing olympic lifting (e.g., I got better at static yoga holds without specifically training them).
Basically... I sucked real bad at most things (hypertrophy, power, strength, muscular endurance) and doing something (in my case olympic lifting) resulted in gains across all of those (and no doubt more besides).
Would I have gained muscle mass faster if I'd have done a bodybuilding program? I'm not sure that I would have...
After some time the body adapts to the stimulus and then you need to pick more specific goals. You start to notice that making gains on one of those goals sometimes results in regression on other things. E.g., snatching more (doing what is required for that) might well result in loss of strength on the powerlifts. It is at this point that one might choose to focus on hypertrophy at the expense of strength or vice versa.
The OP is really very weak... Weak where it really seems to me that he should pick a decent bloody program and work his ass off and eat properly. I don't think it would make a difference whether he picks a decent bodypart split program or a decent strength program (e.g., starting strength).
That is my take anyway. But I could be wrong.