Experiments with Garageband

I am a beginner and have zero knowledge in music, i tried composing something using  garageband software.

Let me know what do you think of this piece of musical? 

Not bad at all for a beginner! The track seems to be building up to a climax, so if you plan on pursuing this song more, I would add that. The contrast between the synth-like bass and the orchestral instruments is also quite and interesting choice. Keep up the good work, work on your craft everyday and you'll soon be writing professional tracks in no time!

So... I'm going to first suggest you study harmony. You seem to know what you've heard and are trying to reproduce it but haven't quite found the rules for doing that. Even having the most basic harmonic language in your back pocket would be good.
It just seems like you're trying to have all the voices do something interesting. This is known as "counterpoint" and no matter what set of rules you're following it always needs to be treated delicately, otherwise it's impossible to distinguish what's more important or what the focus is.