If you wish to trademark your name or logo, file an application at the US Patent and Trademark Office and submit the filing fee.
http://www.uspto.gov
could be a few hundred dollars. You go to the court house and file for a business license. Then there will be some other forms to complete before you actually can provide a service
If you get name and create logo by yourself, the cost is zero.
If you look for some free lancer to help you, I saw the cheapest service is 5 USD.
Found @ your local banner store cost (banner) about $129.
Found online (banner) $49 including shipping.
Call your county for that, I have no idea what part of the world you live.
What do you want to do? It due to your business