I would like to make a huge point that many of the posters here don't take into account. It's the ability to actually GET a loan. I’ll be the first to admit that it is fun to talk about theory of multiple loans at a low interest rate over 30 years but this is much more difficult to obtain then it seems.
On average the banks will loan on about four mortgages with a good debt to income ratio. Of these you will need about 30% down. The price of the properties will dictate how many properties you will be able to obtain. Therefore, if you want a really expensive property it may hold you back from fully utilizing the other three loans. Now there are many people out there that are able to get “deals” from other investors or people wanting out of their properties but for a new investor this is not the case. As you grow building equity, cash flow and credit these types of deals will become available. I know many people would disagree with me but this is how I would start out.
1) Buy one property now and don't pay that down. This is what you will use you build credit worthiness. EVERYONE pays for a good credit score. That’s why you pay interest. Since this is your first property don't go too crazy with price. Maybe under 100k to get your feet wet.
2) Pick 1-3 local banks and sit down with the branch manager and discuss your business plan and how you can work together. I would request a credit card with as high of a limit as possible in our LLC's name.
3) Buy houses with cash AND credit. A cash purchase gives you assets/equity and good cash flow. Banks like to see multiple “successes”.
4) Obviously you need a good team (contractors, managers etc), an LLC or multiple LLCs and exercise patience.
I like the idea of having 10 properties paid off a really good relationship with local banks and cash in the bank. Then you go after a bigger property that acts solely as cash flow and a tax shelter. Say maybe a 1-5 million dollar property which you never pay off.
The goal is to live well. Take time to build a solid base and the rewards will be there later in life.
Hope this helps.