Need to clean metal debris and dust. When you file or grind wood, hold the cleaner pipe at the working place. Vacuum these dusts before it floats in the room, otherwise your PC might get in to bad mood. B Side table works well. Why don't you start.
Stainless steel has a rough surface just after filing.
Then we have to file with sandpaper that should be smoother. Your hands and nails get dirty, callous, definitely need a concentration and patience. Working space can be found if you think it over. It is fun once it is started.