How much can you earn? Which Affiliates?

Hey guys,
I have a site that will be launched in a couple of months. It focuses on experience day sales. I already have a few businesses ready to sign up etc. But what i'm wondering is how much can you make from Affiliate sales per month? I will be receiving around 3000 visits per month.
I've seen a few programs like webgains.
If you are involved in affiliate programs let me know a approx figure your reviving per month along with traffic as it will be very helpful to see if it's a worthwhile…
How much can you earn? Which Affiliates?

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