If I had a CPA prepare my tax return and it is audited, I would expect the CPA to defend his work on my behalf without charge.  

NETWORK. 

I personally do give breaks to repeat clients, so maybe talk to him.her about discounts on future deals.YOu can call around and see what other reputable agents are charging in the area.When you say a finders fee for off market deals, these may be deals where the seller is not paying a commission and he/she is using her network to find flips, foreclosures, probate. etc.  

Referrals are the greatest value you can provide an agent, so reward a good agent for their work and loyalty by giving them some introductions to your network, especially your investor friends.Best of luck on your search to find an agent you can create a long term partnership with.

What questions would you ask a CPA to gauge their level of expertise regarding real estate investing and taxes? 

@Sunitha Alli given that you have never done this, have no network, and have no knowledge of the project you are taking on, I would recommend finding someone that is doing that type of work in Denver and partnering up.

I hope you have something in order by now, but if you don't, I have a good relationship with Inna Khayut, CPA at KATZ, KHAYUT & STROLL, LLPAs well as Alan Tsarovsky, CPA www.taxadvisorygroup.com/Both are knowledgeable about real estate, and very good people.

If it's expensive and has a high annual fee, then talk to some professionals (CPA, Attorneys). 

My network of family and friends are also on a very low income so there is no possibility of borrowing from them.

I think you would benefit from doing some serious networking with active investors in your area and growing your sphere with like minded people.