LLC or other ways to protect new purchases

[Grant Bublitz]

HI BP members,

I am in the process of buying  second duplex and will live in one side while renting out the other. 
So i will be occupying 1 unit and renting out 3. 


Currently my rent goes just to a sole ownership account.

Should i get into an LLC or some sort of different protection as more units are added?

Thank you.