First of all, analyze:
1. Is this really efficient and effective?
2. How fast does this work?
3. Is the site trustworthy?
4. Is this really worth my time?
5. Payment methods?

After that evaluation, if you think it is worth joining the affiliate/money making program, go ahead. If it really isn't that good, rethink about the plan. You don't want to waste time, lose money or become a victim of identity theft.

Do investigate before signing up. It is the wisest option.