pretty ok
Not a bad start for composing.
At 1:45 is totally "My Heart Will Go On" from Titanic :)), like for real, just listen.
Anyway, here are some tips:
1-Get a decent recording/ editing program. Audacity is free and good enough.
2-There is a tool in almost all editing programs named "noise reduction", learn to use it properly and you'll get rid of the white noise in no time ;)
3-There is an option in almost all programs to normalize the tracks, this way you'll get enough volume without distorting/ clipping.
4-If you still don't have enough volume, learn how to use compression (there is a thread in the Audio Forum).
5-For achieving a "larger" sound you can try to use some reverb (not too much). This way the sound will appear as from a concert hall, not a small room.
Hope this is helpfull.
For more tips you can always ask in the Audio Forum.