You don't need a big staff or big bucks to create your plan. Often you will be able to devise a credible basic plan on your own with just a little bit of help. The basic ingredients of any market plan are knowing your product and knowing who you want to sell to. If you don't know you should stop here and go on to something else. You might consider asking marketing classes to adopt your company's marketing plan and market research as a project.
Most business schools are full of students looking for projects.
Check your local Chamber of Commerce for business building resources. Many of them sponsor a series of business building seminars at little or no cost. Another good source of information comes from networking. Get involved in groups that consist of people who want to help entrepreneurs. The Southeastern Michigan area has a wealth of such groups.