Aikido is rapidly growing. IMHO, it may be easier to start in another dojo, through and health club, the Ys, or parks and recreation department. Saves you the over head. See if the local high school or community college is interested in starting a club or offering a class.
For publicity, most papers will accept and print press releases if you can offer the community something. Writing a regular column, or at least submit articles, to local small weekly papers, about how Aikido can change lives can get you free publcity too. Do some demonstrations, talks, and presentations.
Just some thoughts. I do not have my own school (just a perpetual student), but I have my own business.
Did you say Detroit? I grew up in Pontiac.