All good points. I think that one of the biggest mistakes that beginners make is too much wood added to their lump. Once you get past that visual of smoke pumping from your cooker, you will realize that it actually takes very little wood to produce excellent results. If i do buy wood chunks from HD or lowes, oftentimes I split them in half as well, smaller is better in my opinion for the type of cooker you have. Good luck!!! and keep asking questions.
Here are some pictures to give you an idea of just how little wood you need. I throw 1 or 2 of these slivers in the firebox every hour or so. I also use an old coffee can to get them smoking nicely.