Best business design logo maker software

I'm looking for a business design logo maker software which I can use to design my own business logo and to offer a business logo making service. I enjoy designing new logos for business so it makes sense for me to offer this service and hopefully make money. I need a professional software for making business logos which doesn't cost too much. I've seen the free online logo makers and they are not that good in terms of unleashing creative flair. I don't want to spend a lot of money but I want to offer a very good service when it comes to logo design. Does anyone know of any business design logo makers which are affordable and easy to use.