You should interview  2-3 agents.

The book will teach you to follow these steps:1) Narrow down to markets you are interested in2) Interview and build a team in that market (realtor, contractor, lender, property manager)3) Buy, rehab, rent, refinance and repeat :)

I've finally found my place and you are my people.Now, I interview investors before putting them on my buyers list.

At the apartment complex where I worked, we allowed up to 2 pets in the house and they were required to do a pet interview (if it was a dog).

I interviewed a couple PMs and found one that would only charge us $100/month since we're military =D.

It may help if you visit the areas you are planning on investing in and interviewing at least 3 people from each category to make sure they understand what you are trying to accomplish.

It may be beneficial to interview a few brokers and get a feel for the different types of brokerages available to you. 

This recommendation though is not saying anything BAD about another company so just like in every situation, do your due diligence and interview a couple different companies to find one that fits your needs.

Post an ad, today, in Craigslist - pay the $7 they've started charging and start interviewing people if you're serious about the property. 

interview several builders who build multi family, get lots of references from their previous customers. make sure they have a track record of on time and under budget.