Well, that is kind of difficult to answer in a simple way. You are basically asking for someone to map out your marketing plan.
If you do a Google search within your niche you will find TONS of blogs, forums, directories and many more sites which can be your vehicles for your promotion. You certainly can not expect someone to do that work for you.
Finally, in order to succeed it is important to follow rules and regulations and NOT to post your signature until the trial period or initial period is due. The reason a lot of forums have a wait time of 90 days or 50 posts is to make steer spammers away.