First month special price

Today I have two questions. The reason I am asking the two questions is related to my new project. The project will not be launching for a while, probably in mid february, but I am working "hard" at the moment. Most of my work is actually thinking and trying to figure out stuff. My first question is this: Should I have some sort of sale for the first month or so after launch? I see that many companies (MLM and others) have prelaunch deals and many have special launch deals as well. But I am not sure if that´s something I should do. Will more people join the first month if it was cheaper? I am not sure, it will take a while to promote it and I am in for the long run.... maybe a 50% off the first month is a good idea? More people might be joining and they might spread the word. My second (and final) question is this: Should I have an affiliate program? It only cost $99 to buy iDevAffiliate and then I can get people to start promoting my project for me. I will earn less from the people who joins from an affiliate link, but again I haven´t done anything to promote it, the affiliate did the job. It seems like a good idea to integrate an affiliate program, it´s cheap and it doesn´t take much time to set up (hopefully).