How to find a good Investing Real Estate Agent?

[Mandar A.]

I am starting out in Real Estate Investment and I am looking for my first rental investment property. I have spoken with couple of real estate agents and told them what kind of properties I am looking for but I feel as though I am doing most of the research work. So far they have just sent me MLS listing and that's it. I would like them to actively look for properties for me on MLS and if possible outside MLS(may be properties that are not on public listing but are known is some internal network).

I am still new to buying investment properties but is this common from real estate agents. Am I expecting too much?

Basically I hope to build investment property portfolio over the years hence I am looking for a good agent with whom I can build a relation. How to find those kind of agents?