When it comes to closing costs you can use the builder or the equity of the land in your favor to help with closing costs.

EDUCATE YOURSELF - yes, it will take time, but will lead to a selection that better meets your expectations & avoids potentially costly surprises!

What is your average cost per mow in Indiana?

Never flipped before.If you take out a HD loan and say your construction estimate comes in at $100k.Eventually the actual estimated construction costs only cost you $90k.When you take a draw does the bank give you money based on receipts/invoices?

The purpose of house-hacking, as you're aware, is to benefit financially from another tenant/roommate subsidizing your cost of living. 

I would recommend reading the book by J.Scott called "The book on estimating rehab cost" Also, network a lot and consume wholesaling-related content to give you a better picture of how it works. 

That will increase your cost quite a bit and might make the ROI untenable......?

Generally will cost you about one month's rent, and some of that amount may get paid from your listing broker to the tenant's broker that brought the tenant resulting in a successful lease agreement (this benefits you because you are essentially offering financial compensation to other agents that represent who you need: tenants!)

This question becomes very important if your are financing any of the rehab costs.  4. 

Alvara handles it at a cost but still valid point as I do it myself like many others.