But for many people, it is one of a number of sources of deal flow, to add to MLS listings, wholesalers, direct owner outreach, auction, etc.Assuming you are specifically talking about sheriff auctions, just make sure you familiarize yourself with the general procedures for the auction.  

Quote from @Brandon Larson: It's important to have established policies and procedures, but I wouldn't put a lot of effort into that with only a duplex under management.

This day in age just a simple phone number exchange is how I do business. 

You should consult a real estate attorney or tax advisor to handle the legal and procedural details.From a tax perspective, there are several implications.

Hi everyone,I’ve been fortunate enough to acquire 32 rental properties by the age of 30.

Specifically; rules, regulations and permitting procedure.

Congrats on your maturity at a such a young age.   

You start by mentioning your age... you'd need everything to go just right for the rest of your life to make, best case, $400 or less additional each month net cash flow. 

@Polat CaglayanI've never seen a formula but here is a general rule of thumb for multifamily:The class of an apartment refers to the quality of the building, which can be determined by a number of factors, including age, location, and condition: Class A: These are the highest quality apartments, typically built within the last 15 years.

Be careful not to place your identity in your age/success in RE.