Greetings Omar. Using your car as collateral is a great idea if you don't have a lot of extra cash for investing. I first learned that credit unions and banks will give you title loans by Lisa Philips, another BP contributor on her website (affordablerealestateinvesting.com). I have also gotten loans at those chains like TitleMax and they charge like 10% monthly which is crazy. Using debt to purchase income producing asserts is a sound strategy especially if you can build equity or force appreciation to quickly pay off the loan.
Like Adam I have also used 16% Hard Money loans to buy and rehab foreclosures. Those lenders don't care about my fair credit, the condition of the house or my inexperience. They look at my income, the market value of the property after repairs and the overall deal structure. I also use no interest credit cards to buy my materials and appliances which improves my personal credit score. I know Dawn Anastasti used peer to peer loans from sites like Prosper and Lending Club. Lastly you could take out a HELOC on your primary residence and repay it when you sell or cash out of your investment. Leverage is a great tool to build a mini empire and you can use the cash flow from one house to pay down equity on another to get it free and clear faster. Read Ali Boone's post on BP for some lively debates on the topic. Good luck whatever you decide.