Covered calls option strat

First I only like selling contracts against stocks I would like to continue to hold.

My stratigie is first to chart the underlying for support, resistance and gaps. Using those levels I try to pick a strike that is above current price a garage and generally around 10% for higher priced stocks ($50 or more) or 3-4 strikes out of the money. This way I can ensure profit from the underlying if it does exceed my expectations in a manor in which I do not mind selling. If they do not exceed I can be thankful for the premium collected.