What professionals needed for partner and me to partner on deals

[Colin L.]

Hi All!

My partner (not yet married) and I own a couple of rental properties (Idaho) and a primary residence (Seattle). We think it's the right time to establish formal agreements about these co-owned properties, but we also need to establish a business entity to Airbnb our basement ADU in Seattle.

1. What professionals should we consult to pick the right entity? To get it established? 
2. Any trusted professionals (legal/tax/planning?) you have used for this purpose? 

Thank you!
Colin