We've just moved into a new house and would like to paint or varnish the floorboards. There are carpets down at the moment but we've pulled them up and the boards look like they're in pretty good condition - they've just got lumps of paint on where (presumably) the previous owners painted the walls and it splashed on the floor.
What do we need to do to prep the boards? Sanding, probably, to get rid of the paint blotches and some kind of sealant or something to stop too much cold coming up through the board?