Thinking it might show an extra level of professionalism and result in more offers/money

Some only accept accredited investors some also accept non-accredited but sophisticated investors for their deals.

As you can tell from the responses you need a professional to make this as smooth and uncomplicated as possible.

Since I’m also a hard working professional looking for that passive income cash flow from rentals just not sure where to start.

Also it never hurts to do a combination of handwritten and professional letters.

Beam, Post tension, driving piling, bell bottom, floating, pier and beam...Make sure you have a foundation company that is proficient at the type of project you have.I am no rookie, and I have had major issues with 3 (BBB accredited) business's this year who claimed to be experts in foundation work. 

My advice is to just get a professional over there to fix it and move on.

As with any RE professional that you include on your team...make sure that they are investors themselves!

An LLC is a pass through entity so unless you are advised by a professional differently, double taxation will not affect you. 

Second, consider joining a local real estate investment club in your area to network with other real estate investors and professionals locally.