Possible investor for first purchase

[Nick Domster]

Hello all. Future investor with a plan here.

I have a possible investment source for my first time purchase. Plan is to use his money for down payment and possible improvements. I have not yet nailed down a property but I do plan to approach my investor in a few days. So I have a few questions and am open to suggestions.

Plan is to secure a loan for let's say a "Blue House." 3 bed 1 bath single family that I plan to fix and rent. I have $0 to put down and I absolutely refuse to pay mortgage insurance. So I need 20% for my imaginary blue house. Also it is listed with "bring your imagination." So she needs some loving but she's cheap.

Question 1: What is a reasonable expected return to my investor? Do I present that as a percentage of my positive cash flow or a set amount? Let's say he's laying out 25k.

2: This one is clearly open for discussion between the two of us, but what is a reasonable time frame for repayment? I will not draw it out but I also don't want to cut my time short and stress my own income. 

3: Is sharing a loss, if things go poorly, possible to include in this investment proposition? Not to plan to fail, but is it reasonable to ask that he shares a risk in loss with me rather than only sharing a profit?

I also plan to ask for his investment into the improvements. Obviously I could add that into he loan but I'm sure we could work out a better deal between the two of us vs the bank's interest rates. 

Any suggestions? 

Thanks in advance.

Nick