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please don,t say to run the offer and get the best which convert.
Except that anything you please tell me
any adspy site or any tutorial to chek.
That will be fine.

I suggest you to start with a low payout offer. If you have more than $1000 to spend on collecting data then go with high payout offer. If you have less money to invest, then start with low payout offers.
The worst thing that may happen is choosing a wrong offer that will convert bad.Though with offers that cost not so much your risks to loose a big sum are minimal.