We all make mistakes in the beginning... and the middle... and the end. :)  Keep looking and researching, and you'll find a great deal that will work out for you that you can use as a stepping stone to bigger and better deals, rinse and repeat.

Hoping someone can learn from my mistake. 

The funds for rents should have been settled up when you completed on the purchase.If the agent collected funds after the change of ownership the agent was not legally operating on behalf of the prior owner at that point.It could be a simple mistake rather than anything more serious.

For the sale of the home, my property manager also acted as my Realtor which I now see may have been a mistake.

If the OP made this same mistake they can alleviate any worry’s by simply looking at the detailed listing and making sure the seller is offering a buyers commission?

I have a few properties in mind I just don't want to make any mistakes by running off of emotions and jumping into the first deal I see because I'm excited.

Every PM thinks their business will work "at scale", and I just need to get to 100, 200, 500 doors to be profitable and the fact of the matter is a negative number, times a bigger positive number is a BIGGER negative number.Sincerely,A guy who has made every mistake in property management, worked 100+ hours/week in a negative profit company and just now starting to figure it out.

If this is the primary consideration when buying NPNs, it's a mistake.

Made some mistakes in the past and currently only around 620.

But after reading more from some on here, that’d be a big mistake.