Checked your website; very very cool. I used to have an advertising agency, responsible for sales & client strategy. I'll cannibalize an answer I gave on Quora for this one: About getting clients, do: - charity work - hackathons and Startupweekends and such - design competitions - direct work...
The answer is: as soon as possible. Trademarks can take 1-2 years before you go through the entire process. You can apply for a trademark yourself on the USTPO site. Might help to have a lawyer or paralegal help you if you are inexperienced. A simple filing costs a few hundred in fees depending o...