|Logo of free loops (images from the hompage)|
Don't worry about quantity and quality of the sound stock. On that site you will find a lot of sound to download like Bass, Drum Kit, Drum Loop, Sound Effect, Instrument , Synth and Vocal. The site which give free sound effect download is http://free-loops.com/. On that site you can download one by one sound stock for free. But if you want to download all sound in one link you must pay not more then $10. I am not promote this site, I am not receive payment for that site. But i think there are a lot of sound for free to help you, so i share that site.
Beside you can find free sound effects download there, you can ask your question or help another people solve the problem in their forums. There are you can meet another composer and movie maker. Beside it, that site give you free tips and software all about sound like fruity loops and etc.