Rental Business With My Wife

[Kyle Spearin]

Hi BP community,
Up to this point, I've been live-in flipping. My wife and I are planning to rent our first property and we plan on owning it as individuals (with lots of insurance of course). 

For all rental related expenses, we wanted to open a business checking/savings/credit card combination. The problem I'm finding is that it asks if I'm a sole proprietorship or other business entity--not sure what to say here. What's the best way to go about setting up these accounts and the best way to proceed?