Definitely do more research on the BRRRR method as that sounds like what you're trying to do.

I hope to find a single-family home with at least 4 bedrooms, use the BRRR method to turn it into a short-term rental property.

I think a heloc is a solid method to fund a flip.

I'd send out 500 at a time, using a different mailer/method weekly.

Creating an LLC and getting insurance on rental are two methods of "Asset Protection" that most real estate investors use to protect themselves and their assets. 

Find Brandon's videos on YouTube for the "four square" method of analyzing homes and practice.

Used houses in the area sell anywhere from $75-125 a square foot.These are long term rentals that I do not plan to sell.I am reading the Rental Property Investing book and implementing the method that focuses on cash flow and that strategy states you need to have $300 cash flow per month, per property.

I've been using the BRRRR method more recently with some success.

So, something to think about.Next, what methods have you used to determine what kind/size of property to purchase? 

This is why this method is so powerful.