There are several cheap or even free options that can make quite a professional job. My recommendations would be:
MuLab - try the free version, then you see from there how it goes
Reaper - demo version doesn't have limitations and doesn't expire, so you can use it until you're convinced enough to buy it
Podium Free - a bit limited but as a beginner tool might be just enough
FL Studio Demo - well, doesn't save projects but still can export wav or mp3 files, so, why not try the most popular program here?
Anvil Studio - a bit dated but... well... free