Half a Chimney will do then place them in the middle of you other beads, set you air vents to 50% open and let it run. You are not looking for really high temperatures 250'F - 300'F will be Ok. You are only looking to burn off any residual oil or grease left from the manufacturing process.
After 2 hours, you can alter the vents and see if you can get it running at steady 225'F, remember that the body mass temperature will be high, so this will have to drop, before you will achieve your temperature.
let your smoker reach your desired temperature before you add your wood, or you will be wasting money on wood before you are ready to cook.