When can/should I trademark my business name?

I believe that I have a very unique business name for the service I will be providing and the people I will be providing this service for. However, the business plan is a work in progress. Can I or should at right now secure the name before establishing my business structure? I would like to freely use the name to create a buzz, get a consensus, as well as campaign for funding. Am I too early to go ahead and trademark the name without even having a business to really register? At what point can I or should I? Thanks in advance.