Some good advice given already. I'll add my 2 cents because I'm still relatively new only being in this game for a few years now.
When I looked at getting into the real estate business I first thought about my goals, what did I want to do? In my situation I had been investing my savings in the stock market and the ups/downs of that crazyness was just not fun.
So I started looking at real estate. Why? I was watching this documentary on the Great Depression of the 20's. In this documentary they talked about the massive amounts of wealth created by just a few individuals. That's not a typo, that's a fact....wealth. The "robber baron's" like J.P. Morgan and Carnegie and Standar Oil all built the beginnings of their massive industrial empires during the great depression. How? Simple, the waited for the weaker competitiors to go belly up and then bought them out of bankruptcy for penny's on the dollar. When the economy recovered they were some of the richest men on the planet.
Take a look at what is happening in real estate now. The markets have crashed and are severely depressed in some areas. I looked at this and saw opportunity, not despair. My logic is that people still need places to live. Just because the market has busted and people are losing their homes to foreclosure doesn't mean that these people simple disappear....they have to live somewhere right?
So my strategy has been to purchase foreclosed properties for penny's on the dollar in working class neighborhoods. I then rennovate them and use a rent/hold strategy. I like this for a couple reasons. First on every property I own I will recoup my initial investment in rents paid in around 5 years. Secondly, the prices are so cheap that there really is nowhere for the value to go but up. If I hold the properties for a few years or more I can likely sell the property for a significant profit.
A good example of this. The very first house I bought I paid $23,000 for. I put about $5,000 into it. It was an all cash deal so my all in costs are $28,000. I've had the same tenant in this house for 2 years and have received $15,600 in rent over those same 2 years. Now the tenant is interested in buying the house from me. We ran the comps on it and the house comps out at about $50,000 now. So if I do sell it to her I'm looking at a gross revenue of $22,000 ($50,000 selling price less $28,000 investment cost) from the sale of the house and $15,600 from rents received for a total gross revenue of $37,600.
I'll probably pay around $1,500 on commissions and taxes/insurance have cost me around $3,000 over 2 years and probably about $1,000 in misc. repairs over 2 years. All told I'll walk away with a net profit of around $30,000 on this house with a buy/hold/rent for a few years strategy. This is what works for me. You just need to find your niche and work it!