Make the space adaptable for both short-term and mid-term rentals, incorporating smart amenities.

Quote from @AJ Cerbo: Accepting any amount of money implies you are willing to accept payments.Shut down any method of electronic payment.

And my average time to lease a unit is 17 days, via this method. 

I do not have much of my own capital to use to purchase a property and was recently given the advice to either utilize private money to purchase a property or do a few home flips to build my own capital.Does anybody have any advice and/or experience starting out with either of these two methods?

That being said, if you bought 2021 and earlier, and are using the right methods to rent your property - I have seen great return.  

My plan is to purchase single family homes and rent them out using the BRRRR method.  

Even if you don't plan on doing this method yourself I still recommend reading David Greene's BRRRR book.Welcome to the forum!

They have different payment methods, payment plans, payment requirements, charges, marketing needs, reports, etc.

Many of the property managers talk to each other and compare notes and share marketing ideas and 'run comps' on each other.The other option would be the 'enemy method' to search for similar size home within your community and others close by with similar amenities and scour their calendars. 

Depending on the lender's protocols, either traditional or virtual appraisal methods may be employed.