You can learn a lot of this info by following other guides on affiliate marketing, reading through blogs like this one, or visiting premium affiliate marketing forums like iAmAffiliate!
By talking with dozens of bloggers and affiliate marketers, I can tell you that in the first year you can make around $300/month, after the 2nd year, you can make $1000 – $2000 every month, and after the 3rd year, your blog can explode to more than $5000 or even $50,000 per month.

On average, affiliates will earn between $0.15-$0.75 per click-out. While it may not seem like a lot, since your revenue is only dependent on clicks (and not purchase), this can add up quite nicely.
It will take you a bit of time to select the perfect programs, but don’t be afraid to invest in this process as this could make or break your affiliate strategy. Affiliate Networks: Affiliate networks group publishers that have affiliate programs under one single website (like Awin). If you are accepted into an affiliate network, you will find it easier to find and apply to several affiliate programs and keep track of the different offers and conversions. Individual Affiliate Programs: Some companies offer their own affiliate platform, and you need to apply to each company separately (like Survey Junkie).