Hi Mike! I am an investor (2 long term rentals & 2 short term rentals consisting of 5 units) in NC. I am 24 and financially free as of this year. I still have the W-2 job but nice to know I am not dependent on it and can work on my own terms now. I am also a lender and would love to help in anyway I can or discuss any strategies you are considering. I love working with creative financing. I finished my first out of state BRRR this year and have experienced all of the commercial and conventional financing challenges at this point.
Also, (in my experience) you really dont 'need' to apply for or build business credit. It is a lot of hassle for little to no reward. Most conventional lenders, commercial lenders, private money lenders, hard money lenders, etc will just use your personal credit to qualify you but nothing goes on your credit history as business activity will be associated with your LLC and not your personal name.
Whether or not to use an LLC vs sole proprietorship boils down to the strategy and deal so thats not a call you have to make right off the bat if you dont know what your plans are yet.