Best Loan for my first flip.

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I'm getting ready to try my luck at flipping a house. I was wondering what loan would be best for me? Currently I own my own business and do not have a way to provide proof of income. I do have a good amount a liquid assets in the bank. I was looking to put little or no money down, but I can work with that. I have been looking into buy a foreclosed property and most things I have read say I should get pre-approved before bidding. Is this true?

Any info will help.

Scott