I would do the chickens first. Pork butt is always a good first smoke, because it smokes for a long time (adds additional seasoning) and is very forgiving. Chickens will be fine though. Make sure you use a thermometer to determine doneness (I go to 160 in the breast or 170 in the thigh, then rest for about 20 minutes or so). You can use your chips for the chicken. Wrap the chips loosely in foil, and leave a vent hole at the top of your foil packet. You'll want to get yourself some chunks though for ribs, butt, brisket, etc. I only use chips for cold-smoking, or short smokes like fish. Chicken is a relatively short smoke, so chips will work, but I usually use chunks.