Foreclosure Help

I am aware that a foreclosure will stay on ones credit report for 7 years but when does that time begin to pass? Is it from the time you first start the foreclosure process or once the property is sold at auction and account written off?

If proceeds from the foreclosure sale is insufficient would I still owe the difference and have to pay it back?

I want to buy a foreclosure home but, my credit is awful. I have a low credit score and a bankruptcy. What can I do ?

I found some very nice homes that I like but the listing is listed as RESALE can someone please explain to me what is the difference between foreclosure and resale.How much more paper work do you need when buying a resale ?how long will it take for the deal to go through?