The only way to find out is to test. Send them a few offers, a few special deals that involve higher commissions the more sales they make, or even send them promotion guides and a little info about how to promote for themselves if you feel up to writing such guides. Keep in mind though, if you see strange stats, visitors to sale ratios, or people only getting very small amounts of visits, it's more often than not, not going to be your fault. Either hit them with offers, educate them, or keep building and hold out for more of those joint ventures or people with plenty of experience and big lists and resources for promotion of their own. Aside from that, everything else is down to the individual and their skills, and pretty much out of your control, so don't be put off if your first one fifty or so affiliates never make any sales. You'll get plenty more, again snowballing, the more products that you release.
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