I can't say enough about how imperative this pocket hole system is for any home shop and woodworking projects. I have personally used this system on countless projects over the years and I rarely do any kind of furniture building without using Kreg's Pocket Hole Jig!
A pocket hole jig is a system that allows you to create pocket hole joints in a way that is quick, accurate, and secure. It provides the means to drill the screws at an accurate angle and depth in order to have the best pocket hole joint possible.
I find it is easiest to mark all of your pieces first, so you can drill all of your pocket holes at one time. This is especially useful when you have a lot of pocket holes to drill, as it cuts down on time.
Search "Kreg Screw Guide" on TheAccentPiece.com to find a guide to help you choose the correct screw. The Kreg screws are self-tapping so they won't split the wood and eliminates the need to pre-drill holes.
This setting is on your actual jig. You will set this setting to the thickness of the thinnest board you are joining. Lock this in place before moving on.
This will control the depth of the hole you drill into your piece. Align the step collar on the bit to the guide on your jig that matches your wood thickness. Tighten the collar with the provided allen wrench.
Using one of the three drill bit guides of your choice, plunge your drill until you reach the depth collar. Place the pocket holes 6-8 inches apart if you are joining long pieces together. Two pocket holes are generally needed so your piece doesn't twist.
Use the screws that you chose, along with the provided drill bit and clamps to secure the screws within the pocket hole. Glue is optional, although it will make your joint much stronger.