How much money do I need to buy those 56 house provided all of them fit in the same model?

You cannot use a one size fits all strategy here.  

Just don't make a long-term commitment, so you can have the option to change should the fit not be right for whatever reason.

If finishes have noticeable defects, and the house is empty, some buyers can become too focused on the defects.A staged home gives buyers a good way to see how furniture will fit into the rooms.

I'm also going into houses to see if I can fit another bedroom into them  for more income.

Should I even bother to say "I like the house, but only at x$" and leave it at that... some investor working purely cash could make her numbers fit... but not me with some interest cost... and not for my first deal... dont want to do anything too slim on the margins..I would really appreciate insight on how to approach wholesalers in this situation. 

Jump on once you find a decent property that fits your budget and strategy.

I don't believe there is a one size fits all, and what works for one person, won't necessarily work for you.With that being said, generally it is best to have rentals in a LLC, but it is not necessary (key difference between what is "best" and what is "necessary").

I also had past water problems and found this to be the best fit for a possible issue in the future.

I will suggest you stick with your investing strategies as long as it is good, give great result, works and still conforms and fit into current market and economic realities.