Questions to ask to verify the experience of RE Agent?

[Daigo Kurosaki]

I'm going to be using an RE Agent to look for some properties out-of-state, and I've been bombarded by quite a few people who have properties to show me.

a) What are some questions I could ask an RE Agent to verify if they are competent/experienced in the market? 

b) I know that agents profit if they sell stuff, so how do I figure out if someone is just trying to sell me something, or if it's a rental property that actually is cash-flow positive? 

c) What can I do to mitigate me buying a "lemon" rental property?