If all you want to drill is your pen blanks for now then all you need is a four jaw chuck for the head stock and a drill chuck for the tailstock. There are many articles and tutorials on here showing what you need and how to do it. The four jaw will also have th added benefit of allowing you to turn other objects like anything you can start off with a tennon on the end. This would include christmas ornaments, small bowls, whatever your imagination can come up with. I have a drill press in my shop but it isn't used at all for pen making.