Always validate what you read online, things change, I could be wrong, but use this as a starting point in your research.What Is an ADU?

In other words, if you don't fill your unit in the slow season because you're afraid it will cut into your high season revenue, will the high season revenue more than cover the difference?

Here are some tips to help you start on the right path:Education Is KeyInvest in yourself first by reading or listening to books and podcasts about real estate investing.

One more tip – people remember stories that trigger their emotions.

I recommend you decide, take action, and move on. 

For example, you could showcase the family-friendly amenities, outdoor spaces, and stylish interiors all at once, similar to the one shared here (this is a listing photo, so I would recommend you change the text to fit your guests).

What tips or advice do you have for someone just starting out?

I recommend having a pricing software (pricelabs perhaps). 

Practical Tips for Managing PropertiesFinding Good Tenants: Screen thoroughly.

Quote from @Marc Shin: Would like recommendations for curtain colors and rug colors for this living room.