Potential Seller Finance deal to purchase primary?

[Brandon Chen]

Hello BP, 

I currently reside in Valencia, CA, I own my Primary residence (townhouse) and a 4-plex here in Valencia. I have been thinking for a couple of days now that I want to purchase another townhome / SFH in the San Fernando Valley, would it be possible to find a seller finance deal to purchase another home in the area that I want? If so, what would be the first few steps in the right direction? Would I just need a realtor?

Thank guys!