Calculate your current ROE and assess it relative to other investment opportunities.ROE = (cash flow + mortgage principal pay down + appreciation) / (value - current debt)

House hacking can also help you offset your living expenses and gain experience managing a property.Also, building a strong foundation is crucial to you success.

I just got started with my career so I have a low income relative to property prices in my area (Seattle area) property prices are about 10x my income  

The LLC should help you lower transaction costs since you as the LLC Manager can buy/sell property, taxes, etc by writing checks from the LLC's business account.I rolled my SDIRA from Equity Trust, no LLC (poor service, high fees) to Madison Trust w/LLC about 6 years ago.

Multi-family can work out but if you're marketing to travel medical professionals, many of whom work nights and sleep days, you'd need to be able to provide a relatively quiet space and that can be hard to achieve in multi-family properties.

By House #4 I figured out I should do fourplexes/duplexes, and managed to get a fourplex with owner-occupant financing.

You need to know the players in the market, the brokers, the property managers, the contractors, and so on and so forth.

I am considering putting them under a property manager. 

Most of that here will go into the downpayment and closing costs and even then, especially if you long-term rent out the property, you'll likely not cash flow much at all even if you self-manage.  

We have 2 LLC's that run management companies and 10 LLC's that do real estate investing.