Know the house and the finishes, if its out date stage it to look modern or make some renderings of the updates.

Not super picky Contact Preference: DM MeAdditional Comments: Conference dates only  

You can also check their reviews online at Google, Facebook, or Yelp.

I read online that apparently for WA state there's a state and national broker exam.

You can probably find most of the books online like Amazon or someplace local like 1/2 priced books. 

For example, Brandon Turner was great as a podcast host that helped a lot of people and now seems like another slimy online guru who is better at promoting and fund raising than being a good operator. 

I would probably try to speak with them face-to-face or on the phone and finish the conversation by telling them you will send them a formal letter shortly with the exact date after you talk with your contractor/partner, etc. 

Check out other online guides available here: https://www.biggerpockets.com/guides3.

If you can keep your home data up to date and make the site user friendly your already off to a good start.Just do not become a lead generating platform when you do that you end up with a higher percentage of users who fail to return. 

A few things I do personally for clients is: create a P&L, market to my buyers list, pre-market the property online where the target audience is, and make a plan for bookings and the booking calendar to minimize losses while up for sale and operating simultaneously.