He’d pay $50 - $100 for these, and wait thru the redemption period and then file for title.

I would greatly appreciate any advice, experiences, or resources you could share to help me plan effectively.Thanks in advance for your help!

I dont know the answer here, it is above my pay grade but if I were you this is where I would start.Talk to a lawyer.

Willing to extend benefit of the doubt to someone packing up shakers (not paying attention), and yes, all this is small beans and easily replaced.

It was clear to both parties, with email exchanges confirming that the end date is July 15th and lease won't be renewed.However, I forgot to stop the automatic rent collection through Zillow, resulting in the tenant paying the full July rent on July 10th, which has already been transferred to my bank account.

Seems like they will, but no one knows by how much nor what exact impact this will have.My plan is: buy real estate

I would recommend BackFlip, but you do pay a little more on fees. 

If I flip a house and make a profit after 6 months, then buy a new property 3 months later, what taxes will I be obligated to pay?

I even heard of a landlord being sued and losing and having to back pay all the rent payments. 

Some folks will argue properties are typically taxed less than their fair market value, and that may be true, but it's the amount of annual taxes your pay (regardless of actual value or assessment) that will affect your bottom line.Additionally, until the recent market correction both property values and rents have increased at a rapid rate.