That's a reasonable step up and gives you a chance to develop some processes to manage your properties.I'm a big believer if you want to scale up, that you've got to develop processes that help you efficiently manage properties. 

Whether this be general unit improvements or perhaps making units more energy efficient.

I know this is the bare minimum, but I would like to get some advice on what I need to be doing to make the process of scaling much easier and more efficient. 

I am just unsure how to efficiently use my working capital. 

I would agree with the above as far as house hacking or considering a multifamily (or even a townhome with a lockout efficiency suite)  so you can live in one and rent the others out and minimize your downpayment by using FHA.

It wasn't a hard deep inspection just no serious hazards, electrical outlets work, is the unit energy efficient etc.

Incrementally increasing efficiency rarely pays for itself unless the original item has died.

Capital Equity is the example OP noted, and for those with reduce leverage.Sweat Equity is being a price taker instead of a price maker (brrrr crowd, self-managing vs use PM, those who find discounted assets... and so forth).Market Arbitrage is vague, but I define it as getting into a market before it reaches efficiency.

On top of that, the cost of energy efficiency is adding significant costs and new complications to the projects.  

Along comes a service that makes it super easy to pay and guarantees you will be taken to your destination in an efficient manner.