This, I am sure, is a daft question - but then, I'm an utter, utter newbie to DIY - I brought my first drill yesterday from screwfix (a Makita BHP453SH)
http://www.screwfix.com/p/makita-bhp453sh-18v-1-3ah-li-ion-cordless-combi-drill/58614
- and I got a set of drill bits without reading...