Depending on the country I would first see if any local banks will loan to Americans. 

My best suggestion for finding a mentor is to start networking locally.

Therefore, I'm focusing on Texas for now.Here are some specific points I would appreciate advice on:Cash Flow and Growth Potential, Market Stability, Property Management, Local Insights.Additionally, if there are any realtors here who specialize in investment properties in these areas and can help me grow my portfolio, please reach out.Thank you in advance for your advice and suggestions.

In bold-- because that is what is advertised.

That info will allow a local expert to weigh in if you do plan to keep it. 

So I am seeking advise on platforms to advertise the units, how to vet potiential tenents, how to create a lease agreement, how to collect rent, and any other helpful tips/advise that anyone would have. 

If that looks good, I do my own google check and also look at local court records just in case something was missed by the background check.

Some things I wish I would've done sooner:- Find out the requirements for each local MLS you intend to join. 

Just know if you want low money down and you do owner finance/subto/lease options, you will need to do direct to seller advertising and have a good real estate attorney.

Use the enemy method and the search function in local Facebook groups.