Do a search on Amazon. There are several books available. Keep in mind, a good mentor and some field experience will go a long way in helping you develop a workable system for estimating.
Don't rely on the journeyman saying it will take an hour to do something because they always give you their fast time when they forgot about travel time, getting the material at the supply house, and driving to the job. As well as forgetting the profit and paying for the person typing paychecks!