Check out these tips on drilling and countersinking.
You need two basic tools to make holes in wood: a bit to cut and a drill to turn it. If you want the hole to be of a precise depth or angle, you'll need some extra help.
Although you can use a hand-powered brace or a hand drill, a corded electric drill or a cordless drill/driver gives you better control and more power for little added cost. A drill guide increases accuracy.
There are many types of bits you can buy. Brad-point bits are better than standard twist drills for woodworking because the twist drill's point tends to wander when starting a hole. Brad-point bits have a sharp center point that keeps the hole where you want it.
Use special counterbore and countersink bits to make pilot and countersink holes for screws. A drill stop limits hole depth.
Before driving a wood screw flush with the surface, drill a countersink hole with a countersink bit. To recess a screw, use a combination bit to drill a countersink hole with a counterbore. Conceal the screw head with a standard wood plug or one you make with a plug-cutting bit.