You may want to check out the free sites listed above first, but if neither of those work for you, I was really happy with a
Logo Creator software that I purchased for $20 at Office Depot. Looks like it's $30 if you buy it online. I know there are other softwares for sale if you have an Office Depot or Office Max nearby...you may want to check out their selection. I am definitely not a graphic arts person but I created what I think is a nice, professional logo with the Logo Creator.
Good luck!