In my experience, you will want to be comfortable working with the lender so, for example, I would search until you find the lender that takes the time to explain things until you both clearly are on the same page and you are not overwhelmed.

This is assuming im comfortable with my margins and my monthly payments and holding costs.Ex. purchase price : 103kARV: $165K x 70%=$115500( hard money loan)rehab: $30k(in escrow)closing cost and cash needed @ closing $28k (HELOC)The numbers are just used to give an example and aren't any actual numbers. 

If you can find a market you feel comfortable with where you can buy for 30-35k a unit this will work (66-57 units).

I would just not feel comfortable putting that fridge back in a rental for someone else since that looks like insect droppings and larva.  

Then I used the profit to make more improvement to my place, which enabled me to charge more, and now make a very comfortable profit.

You might do this 2-3 times...depending on your comfort level.If you think the numbers and timeframes work for you, then go for it at the next auction.If your goal is to acquire properties, then go see everything you bid on, before you bid. 

I just met with an investor yesterday and he said for the first time that "he knows enough people that we could comfortably raise $250K." 

I own a Custom electronics installation company #Teatrograde, so I have a system I install that will benefit me as the owner but also provides ease and comfort to the tenants that pays for itself by providing my tenants with wifi at an additional cost, competitive to the internet providers.

Do your research and do what you are comfortable with.   

Be creative and charge whatever will make you feel comfortable with having that pet as a tenant.