Remember, you are in a virtual world, there are some important facts you must look for when you are choosing an Affiliate Program online.
1) Does the program provide you with a powerful website using your name/username in it? If so, will it have materials like reading material, speech. training materials, tutorials
2) Does it provide a multiple stream of income?
3) How is the compansiation plan? Will you need to enrol many ppl to earn a good income? If so ...dont go for it.