2 ways with 8x10
since it is b&w, you put the negs into a plastic 5 wide by 7 rows neg filing sheet. Carefully place the neg filer sheet over a piece of 8x10 - it can cover the whole sheet, with just the top row of perforations being cut off with the type of sheets that I buy. Carefully squash the sleeve in contact with a piece of clean glass, and expose under the enlarger.
I you want to spend on the expensive filing pages, you get the one that slide the contact sheet in the same page in front of the negatives.
Or, be like me, carefully center the contact sheet on a 3 hole punch, and then put it in the 3 ring binder in front of the negatives to corresponds to.