Investor : How much to pay your real estate agent

[Priyanka Singh]

Deal real estate and Investment Gurus, 

I am trying to understand what should be a fair term and fee that an investor should pay to their investor friendly real estate agent (Considering the maket focus on 80-100K homes all over metroplex). In this DFW seller's market, writing crazy number of offers and comps timely, so the investors can make a deal is very challenging and hard work for a realtor. Hence a good investor friendly realtor is hard to come by. 

I am new in investing world, I'd like to know how do you set your tems with your realtor. Small weekly fee? Fee per offer/ comp/ run around showing homes. And how much is a good amount so that we don't end up wasting anyone's time. Also if we find a house off MLS, is that okay to ask for a commission percentage back from realtor?

Any input will be very valuable.