Using quicklights for me makes it worse, but the CHQL and similar coals arent grouped in that bunch for me.
make sure to stay properly hydrated before and during the smoke session - if youre drinking something else, cool, just have a glass of water there.
do not exceed 4 inhalations per minute, especially if you are a noobie, if you can the good for you, just limit yourself to 4 initially and work from there.
bojangles wrote up something nice about this a while back
as for part 2. there are vids on how to clean a hookah, sam has one that even uses beer to clean a hookah.
dont use soap on glass, baking soda and water....... for stem, use water and the brush, every now and then add baking soda to the water, run it through, cap one end, add some lemon juice and scrub...
never wash a hose unless it is a washable hose (most are not washable!)