There are thousands of affiliate program as we know.Which one think is fairly easy to make money.Please recommend such affiliate program where I can get a sale easily.
All make money, its your traffic and promotions that will determine how easy it is. What are your promotions, or marketing?
I suggest you sign up with some reputable CPA (Cost Per Action) networks and try to promote cpa offers. CPA offers are easier to convert because most of CPA offers don't require a credit card, unlike CPS offers which do.
Making money depends on how you go about it. Someone could make loads from one program where you may make nothing from that same program. Trial and error is the best way to go. I find CPA, CPM, CPC are good, but also residual pay per sale programs are pretty good.