Are you referring to purchasing a house at a sheriff sale? Contact your county sheriff or check out their website to see what the procedures are. It's slightly different in each county.
For example in Montgomery County, a successful bidder must pay 10% in certified funds immediately and then they have 10 days to pay the remainder.
You would also need to be concerned about liens that may be on the property. Buying a house at sheriff sale will remove the lien from the lender that filed suit, but there could be others. (mechanics liens, municipal liens, etc etc) Whoever buys the property is responsible for these.
Even if your getting a clean title, it's highly unlikely however that you'll be able to get a traditional mortgage underwritten and closed in 10 days, so you would have to seek alternative means of financing if you do not have the full amount in cash.
You might be better off looking at REO (Bank Owned) properties.