First meeting with a Wholesaler. Advice?

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I am meeting with a wholesaler, which I have never done before, and going to look at properties that I may be interested in purchasing.  

It seems that many investors work with wholesalers, is this true?  If you have worked with wholesalers, what have your experiences been like?  Positive or negative?  

What advice would you give to someone just starting out?  Questions I should ask?  Things to be aware of?

Thanks so much!