Need some advice for a good program or programs to create/edit sounds.
It depends on how deep you want to go.
An easy accessible tool surely is Audacity.
I prefer Wavosaur over Audacity, because it's a bit more flexible.
And just like TheBen recommends FL Studio, I also have a non-audio-editor recommendation. Cockos Reaper probably is the most versatile tool for all things audio. Among other highlights, their excellent timestretch- and pitchshift-algorithm integration also makes it very interesting for game audio. Plus, the complete and uncrippled full version has a 60 day evaluation period.
In short: quick and easy = Audacity/Wavosaur, hot and spicy = FL Studio/Reaper