What do you mean "solder two holes together"? Do you mean connect them with a piece of wire? Soldering is much easier if you use flux. Do not use plumber's flux because it has acid in it which eats up copper. Use non-activated rosin flux. Most electronic solder has flux in it, but coating the copper with flux helps. Hold the soldering iron on the pad and apply some solder, holding the iron there until the solder flows and is smooth. It takes some practice.