You can low and slow on a kettle. It helps if you use a thermometer but is not really needed,you will just have to play with vents to get desired heat(alot of guess work and varied cooking time). I use the kettle all the time for all day smokes when just cooking for wife and myself. To much fuel to fire up smoker for that small amount. I use the minion method(light a half of starter and pour onto a pile of unlit charcoal) and you can smoke all day.
Wood i've tried wet and dry for me dry works and tastes better.
All vents open gets very hot in a kettle but that also depends on amout of charcoal. I use the indirect method and put the vent over the meat opposite of the fire to pull smoke and heat over meat. Unless cooking steaks vents are never fully open unless you like black and crisp.
I always close to vent to put out fire and reuse left over coals, put the back in chimney and relight.
Boneless porkchops are one of my favorite grill foods, Marinate in whatever you want and smoke for about 2 hours. Go easy on wood for some reason this cut doesnt need lots of smoke like a butt or ribs do. IMHO
If you are using the small 18" version in my opinion it is to small to smoke in and is only big enough to grill on.
I have smoked turkeys,porkbutts, eye rib roast about anything that is grilled or smoked on a weber kettle as it is the most useful grill ever made(and it lasts for yeras sitting outside in the weather)
Go to this site and do a little reading
http://tvwbb.infopop.cc/eve/forums. All the info you will ever need.
This forum we are on here seem to be mostly folks with gas grills.
I have 4 grill JA 720-0142, a Weber Gold, a Char-Griller SFB and A Weber 22" kettle. The kettle gets used the most as it cooks the best and no real mess to clean up,just empty ash out, wash grill(or burn off) and ready to go the next day. Living in Florida makes grilling an every day event.
Good luck and just play with the vents and you will get the hang of what ever you want it to do. No bbq is bad just eat your mistakes(except for under cooked meat)' your wife will learn to eat them also,at least mine did.
But go buy 2 thermometers 1 for the meat and 1 for the grill. Asking hours to cook is no help, you need a thermometer to tell you the meat is done. The finger test is good for steaks but not low and slow.