So, if you need to make a 25% down payment on a $200k property, then you'll need at least $50k (+closing costs).

Wholesaling is a great low cost way to make a lot of short-term cash, but it does not build long-term wealth.

I see too many investors now, put a significant amount of money in rehab costs and over leverage themselves on hard money loans with low down payments, their properties are not selling and they are lucky to just payoff their current hard money loan via a DSCR refinance. 

At this point since it's after the fact while not totally correct; you may explore adding the missed asset/basis amount as a selling cost to just reduce your gain. 

Does anyone have a template or method that they use in order to screen tenants effectively in order to reduce the risk of non payment and damage to the property? 

I do not think it would cost too much to tone it down howeverI got a $10k quote (minus fees) from an interior decorator recently to redesign.

Many investors in your situation also explore seller financing or subject-to deals to minimize upfront costs, especially if they find a seller open to creative terms. 

Can you give more details on your numbers, purchase prices, rehab costs, time to complete rehab, ARV, monthly rent?

Obviously need to check zoning and set up costs etc. 

Of course have your costs researched first bc the buyer will want to know how much it will cost them to buy.