Hello there! I might interested in your topic. What can i do for you? if i can help you something nifty?
For sound effect i really can do anything else may be i recommend you this piece of software
bfxr.net << have you ever heard of this?
for more better sound you might want to use Digital Audio Workstation (DAW) << this software range from free to paid (many all of them were paid but still there's some software are free)