I would certainly check with a real estate lawyer in your state because the devil is in the details sometimes. 

You may want to check out state & local laws about 3rd party property management and confirm you can comply.Regarding what to do, check out all the materials BiggerPockets has under the Manage Properties tab! 

My company currently manages 15 properties, with 20+ leads in the pipeline, and we’re expecting to double our portfolio this year.

Some markets to check out: Lake Tahoe (high demand but strict permits), Sonoma/Napa (wine tourism, tight restrictions), Gold Country (lower buy-in, seasonal demand), and Mendocino Coast (beautiful but limited STRs).SoCal spots like Big Bear and Joshua Tree tend to be more STR-friendly.

I knew that the property would be easy to sell to another investor or owner occupant, as it was affordable and a 3BR/2BA of 1,650SF so it checks the boxes for many prospective buyers.

Well this is going to be more mandated by your investor base than anything a mentor can help you with (i.e. there are groups raising money targeting low double digit returns, with limited cash flow, and other groups that need to show mid-20s to get investor interest).Lastly, if you are looking at a mentorship: really hammer on HOW they will help you be successful. 

You are deciding between buying a multifamily or a large home and renting rooms and asked the pros and cons of buying a large home and renting rooms.The first thing you want to consider is zoning and how the local government regulates rentals.Some communities limit the number of unrelated people who can rent in a property.Once you confirm how many people can rent in a property you want to have a local title company look at the deed and covenants that may limit the number of unrelated people who can live in a property as well.The pros are a property may check out that you can rent to a reasonable number of people in the property and the cost of the big house may be less than a multifamily offering a greater ROI and you are using the property for its highest and best use adding value to the community with affordable housing.To Your Success!

Would love to check them out.

When I went to closing I got a check for 36k for rehab and my money.

People are always wanting passive yields where they do next to nothing for checks in the mail.