Once I have a good portfolio I can quit my job and focus more on REI.

With no credit/assets/income/proven history you're going to have to leverage relationships you have in order to get funding, and even then, it'll be an uphill battle.The best bet would be to find a partner/investor willing to take a risk on you, if you have a portfolio which details your experience that would be a good first step.

I have been considering switching up my portfolio to long term commercial leases, or renting shop space (commercial leases.With so many options out there I was wondering what some of your best headache free real estate investments have been: some examples could be storage units, multifamily rentals, commercial buildings with long term leases, etc.

You can keep it in your portfolio and acquire a few more to maybe offset your losses.

Are you looking for properties for your personal portfolio or to wholesale to other investors?

Or, was it a long term hold acquisition in which you were buying the asset to keep in your rental portfolio and have tenants pay it off for you?  

Typically LLC financing is going to be some sort of portfolio lender.  

Already wholesaling/rehabbing/holding in my portfolio.

I am a small time buy and hold investor but would like to get into other facets of real estate investing and greatly expand my portfolio. 

Should help boost my real estate portfolio.