But I am not sure if there is any other possible issue.b) how much is a good rent to charge them extra.

A rehabber will probably have to account for a little extra time to sell the property, so you may want to figure that into your wholesale price.

Not gospel truth but I usually find that it gives a reasonable estimate.Also just so you know $200K is a LOT for a 4 family in Fitchburg.  

I've decided since I've recently landed a new job and have some extra disposable income I'd like to invest as a private money lender.

I tried putting limits (ex. tenant pays extra if the electric bill goes over $100) but that didn't go over so well and I didn't do it again.I suggest just bundling in utilities and splitting the costs of TP and maid service.

The seller likely doesn't have a bunch of extra money laying around to replace the fridge or they probably wouldn't be doing a shortsale in the first place. 

I will not buy a house in a flood zone just given the extra insurance required and liabilities...especially if your plan is to buy and hold.Even if there has never been history of flooding, there is always a chance.

They will be very anxious to work with you so you might have to filter through some sales pitches to get to the truth.  

. $5,500 installed.So with 2 new different brand systems and vendors, is it recommended to pay the extra $725 for vendor 2?

Often this is like buying a Prius to save money on gas you will never recapture on the life of the car considering the extra capital outlay.The main thing is to check what successful landlords are doing in your area that rent at your price point.