If I understand your post, you are asking about lump charcoal and if you should break the larger pieces down.
I would not break them down, unless they do not fit into your smoker/coal basket.
I have used the Cowboy lump in the past and found that it burned quickly.
I switched to Red Oak a while ago and have been pretty happy with it. It burns slower and seems to burn hotter than Cowboy or any other type that I have tried.
Typically, I use the minion method when firing up the smoker.
I load the basket with lump and then "scoop" the center out about halfway down where I then place a lit chimney, half full, of roaring hot coals.
This will get the lump burning pretty good, and a loaded basket usually lasts about four to five hours.
Good luck!