Sell my CA Home, get $100k to invest into cashflow multi-family?

[Vitaliy Merkulov]

I listened to Thursday's BP podcast #238 where guest Michael Swan talked about selling his condo in San Diego and buying a multi-family cash-flow property. 

I own a house in Sacramento, CA where I live, I bough it for $225k 4 years ago, now my realtor says he can sell it for $325k in one week. 

What if I sell my house, get ~100k and use it as a down payment for a multi-family cash-flowing property out of state. 

Any thoughts, where should I start? Any gotchas should I watch out for?