I just try and set up multiple showings at a time.

There is of course an initial time investment to get your listing set up, but once it's up it's no big deal. 

For example, let's say the going rate of comps within a specific set of Single Family Homes is 350K-$375K.

So I’m looking to buy my first deal, at the moment I don’t have the capital to pay cash for a $60k property, I have been looking at getting an FHA loan, doing the rehab, putting a renter In place, and hopefully be able to refinance with a traditional 30 yr mortgage, I have the cash set aside for a $15k-$20k rehab, so my main thing is does this make sense to do?

Maybe start by inquiring about markets close to you, setting up a keywords search for them and following those that are major BiggerPockets contributors in those markets.

My mind set was to just put it on as is and get what I can get and move on to the next.

The ACS is a sample-based survey with responses pooled into 5-year data sets.

Set up some keywords for your area and check for local meetups. 

Bought it for $90k, renovation budget set at $15k (on pace to be under by about 20%), and an ARV of $140k.

If they paid late, they broke the lease and should have to accept the consequences set forth in the lease.