If it's a IM launch I would recommend warriorplus or jvzoo.
You'll probably need to reach out to people in IM with lists. Join some fb jv groups and when you have a date for your launch post it in there. Also remember to put your launch on muncheye.
Build a list prior to launch. Basically give them a bit of your product or something closely related. Then follow up with a sequence giving more neat information while warming them up for what they can learn in your product. Push hard close to launch and on launch.
You can build the prelaunch list with solo ads or similar.
Hope this helps