My idea is to offer the $600k, I pay current owner $2500/month for 5 years and buy out the rest at the 5 year mark. 

Therefore, they might go for the agent who is willing to offer the lowest fee or go directly with the listing agent.For our deals, we will still be offering at least 2% to the buyer's agent because we would rather have a large pool of realtors bringing their clients. 

I look for opportunities to offer MORE for a tenant but I look for low hanging fruit in this regard.

After number crunching, we want to offer terms that work for 20% down + rehab estimation.. that puts the offer at around $525K.

I don't think i have much advice to offer since I'm not at this level yet, but its comforting seeing people with large portfolios in CT. 

Any suggestions on what is a fair amount to offer for the monthly interest payments and the balloon payment?

A very important note to your getting started phase - No real investors want to "to grab a coffee or hop on a call" without getting to know a little about you and knowing if you have something to offer them.

In general it sounds like "help me help you" is the best approach, what else has worked for people as far as things to offer?

Worst case scenario you have to offer a small rent concession, but now you know where the market is.

I have someone who I want to pitch to be a private investor and fund a flip from start to finish.Wondering if anyone has experience doing this and would like to offer some advice.Also looking for any recommendations as far as how to ideally structure the funding for the deal.Thank you