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The vast majority of work at home "opportunities" offered on the web are some sort of scam, one 'expert' on an ABC TV report stated that 53 out of 54 offers are some kind of scam. Data entry is up there on the scam list, and is most likely to be a poor paying chore done mainly by 3rd world economy workers.
http://abcnews.go.com/Video/playerIndex?id=7016398
Data entry is not really a part of Affiliate Marketing, other than getting a commission for recruiting others to join or calling your outsourced blog comment spammers used for
SEO purposes your data entry workers.
The majority who venture into Affiliate Marketing fail without making significant money, those who do succeed, and some do quite well treat it like a real business and are prepared to experience several failures in the learning/prospecting process. One forum know for being frequented by mostly rookies is Warriorforum.com, reading through the conversations should give you an ideal for he actual processes involved, you can find some there reporting they have been dabbling at it for a year and have still not profited.