The mesquite lump will give you a light mesquite flavor. You might want to try it just by itself the first time out - maybe on some chicken. Then if you decide you want more flavor start with a very small amount of chips/wood.
I have a Char-griller and I find if I put 2 fist sized chunks of wood directly onto the hot coals every 60-70 minutes, for the first 3 hours I get a good flavor. By placing it directly on the coals I allow it to combust fully and after 30 sec. to 1 minute of heavy smoke it settles down to a nice thin blue. I have done turky, chicken, and pork shoulder this way with great success.
I have a Char-griller and I find if I put 2 fist sized chunks of wood directly onto the hot coals every 60-70 minutes, for the first 3 hours I get a good flavor. By placing it directly on the coals I allow it to combust fully and after 30 sec. to 1 minute of heavy smoke it settles down to a nice thin blue. I have done turky, chicken, and pork shoulder this way with great success.