I have bought many properties at a "trustee sale". In some states "foreclosure sales" are handled by a "trustee". Others the sheriff handles them.
Here's the first thing you need to know. The rules are different from state to state, and from county to county within a state. You need to know the rules in your county. Since you don't, don't bid.
Next, there are typically no warranties with a sheriff's sale, as there are with more routine types of sale. So if a title problem should crop up later, you got a problem.
Then, most trustee sales, and sheriff sales I have bought properties at required CASH on the spot. In fact, some sales require proof of cash in the form of cashier checks in the amount of your bid before you bid.
The initial bid will be in the amount of the mortgage. If you bid less everyone will just look at you. It's a non-starter.
One problem here is that you definitely need to search the title. The sale could involve a second for instance, and IF you buy you would buy with the first mortgage remaining as a lien on the property. You don't sound like a guy who know the condition of title here.
Buying at a sale is an area for pros. If you're not one, don't. Wait until the bank takes it back. Then make an offer on the property. Then you will able to inspect the property, get a mortgage, etc etc. In short, buy the property normally, and probably buy it under market. As a matter of fact, there are fewer deals these days at the foreclosure sales because the value of the first mortgage is too high relative to the property value. You can usually get a better deal by waiting for the mortgage holder to take the property back, and then making an offer.
OldTrader