STR Set up Questions! LLC, furnishing expenses, etc.

Hi, I'm considering converting 1 unit of my duplex in to a STR. I currently live in the unit that I will be converting into a STR. I'll be moving into the other unit.

1. Do I need an LLC in order to claim tax benefits for STR?

2. Can I create an LLC just for running the Biz/managing aspect, but not transfer my property into the LLC?

3. How does moving my property to LLC affect how I can get HELOC, refinancing, selling the house?

4. I don't plan on expanding my portfolio, is it even worth getting an LLC?

5. Since I am converting my Primary Residences into a STR MID-YEAR, does that go beyond the personal use days or does it start counting after STR service starts?

6. I'll incur start up cost setting up my STR; like furnishing my STR. Can I claim these expenses as deductions for my STR?

Are there any companies that can help set up LLC and does accounting for STR?