Attention!!!?

The other day I asked a question but didn't recieve the answer I was looking for simply because my question was misunderstood so I am going to ask again. I've filed a trademark application. I would like to write up my business plan over the next six to twelve months and have it ready to go as soon as my trademark application has been approved. My question is simply how would I go about researching projection cost and marketing for my product. Please answer if you have helpful advice. I don't need to know about trademarks I have already gotten past that sections I am ready to move into the next phase of this project.