What should the market rates be before I consider refinancing out this loan? 

Many start an LLC for real estate and think they can get a line of credit or business loan - but you do not have an operating business, you are investing.

As someone who doesn't have a massive sphere in their market, best specific advice for networking to grow that sphere quickly?

Consulting with a real estate attorney or CPA is recommended.Good luck!

Seeing these shirts every morning was a huge motivating factor for me to continue to work hard to build our real estate investing business and pursue our dream.

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

As a fellow professional looking to get into real estate investing, I can definitely relate to the challenges of balancing your practice with exploring investment opportunities.

I plan to focus on short-term rentals in a property that I’m house-hacking, and hopefully move on to multifamily properties from there.I purchased Brandon Turner’s books Rental Property Investing and Investing in Real Estate with No Money Down.

They're in every market. 

There are better more experienced operators out there... don't be swayed by the Brandon Turner marketing machine like I was.