Additional costs on investment?

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I recently got in touch with a friend who is a re loan broker. I am planning on purchasing a home as close to 100% financed as possible using mostly first time home buyers loans. I have a few connections with general contractors and painters so the plan is to do some work and put it back on the market within 3-5 months. My questions are:

What will closing and escrow costs be? (I dont have specific numbers yet)

What additional costs will accompany such an investment? out of pocket expenses?

Any ideas or experience with home improvement loans?

And I DO realize I have a lot to learn before I dive in but thats why I'm here :D

Any advise is appreciated.