How do you start a property mgt co...and start managing properties for clients?

Advertise on Craigslist for investors. Make sure to let them know that you will handle their rental portfolio for them after the purchase and you would be happy to handle anything else that they may own if they need assistance.
I did this in 2005. SOLD 137 properties and went up to 160 rentals in a 14 month period. Then the market crashed. Most of them have been Short sold or went to trustee sale now. I lost them all a few at a time and have about 50 left today. You can also apply with Tenant Access or US RES and do REO rentals.

Step one: get your broker's license.

Do you already know the business end of it, and are simply looking for marketing advice to build a client base, or do you also need to learn the property management business?
If you don't know the business, I highly recommend you start by buying a few low-end rental properties, fixing them up, signing rental agreements on them, and all the while learning how your municipality handles things like rental registrations, lead paint certifications, renovation inspections and permits, advertising for tenants, real estate staging, etc works.
Assuming you already know all of that property management related stuff, and are looking to expand your client base, I would join some real estate investment clubs, start networking among them, meet a few hard money lenders (they often have REO they need to rent out, or at least know a lot of investors), and start getting to know as many real estate agents as you can.
Basically network, network, NETWORK. Your job will be to know everyone involved in real estate in your given market, and you should take it extremely seriously. Go to seminars, get people out for drinks after meetings, etc. Here's a good article on real estate networking real estate networking, if you need a few tips.
Best of luck with your new property management business!

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Brian
Property Management Software

Good advice...I have dont some advertising on CL for it....have one client right now but it moving slow...he is a civilian in Irag.
Do you have a good headline and copy to use if you dont mind sharing?
Thank you

What does getting a brokers license have to do with property management...I am curious...Thanks

Build an Internet presence showing you as the expert in your area. I started my property management business in early 2009 but had a website strictly for property management since 2006 and I referred all the business to a property management company until I decided to build that part of my business this year. I have top rankings for my area and I generate 90% of my business from my websites.

Good luck!

sign up for Tenant Access

It's the law. Don't overlook step one, ok?
http://www.allpropertymanagement.com/propertylaw/property-management-law-in-texas.html

A salespersons license is all you need. You do not have to be a broker. If you refer back to the above link it states "A salesperson working under a broker may engage in such activities".
Your broker does need to have a Trust account though.

^^ he wanted to know how to start a company, not how to work for a broker who's already established one.