Make friends with someone local who is a landlord (maybe your own landlord or a former landlord).
It's definately not for everyone. Far more is involved than opening the mail once a month to deposit the rent checks. The comment above about being able to do your own repairs is very important, otherwise expenses will probably eat you alive in short order.
Good luck finding a jurisdiction that is pro-landlord regarding evictions. In my area it takes a minimum of three months to evict a nonpayer, and that's if you start the process right away. OTOH, evictions are tough, emotionally and financially, for the landlord too. How would you like to throw out a woman with young kids in the winter because hubby took off?
The cliche is location, location, location are the three most important aspects of real estate. For a landlord, it's good tenants, good tenants, good tenants. One bad tenant will drive out the good ones almost overnight. Its a matter of luck, gut feeling and personal relations. Incidentally, race is pretty irrelevant in my experience. Back when I was a landlord, the best tenant I had was a single black mom, followed closely by a male gay couple.
Don't buy a rental property with the expectation that future appreciation will occur. If the numbers don't make current financial sense-ie, if your projected monthly expenses excees the anticipated monthly income, stay away.
Your income taxes will grow more complicated. If you have high taxable income being a landlord can help shelter your current income, but eventually it will catch up with you (probably when you sell and don't replace).
The people I've known who did best as landlords would form a partnership, buy an older 20-40 unit building in working class suburbs, hired onsite managers, etc. But be prepared to have to feed the business cash (especially early on) when shortfalls occur.
I'm not a landlord now, but I still represent a few. I have absolutely no desire to get back into that business. It's not for the fainthearted or foolhardy, but attracts plenty of each type.