Upload & Sell: On
Start with a business plan. Decide who you will sell your services to, how you will market to them, what you will offer them, how you will charge them, how much you will charge them.
Write it all out, make sure it's grounded in reality, not fantasy, then go do what you plan.
There are a lot of business plan templates on the web that will help you with the specifics. You don't have to be fancy, and you don't have to cover every little detail, but you have to have a plan.