The first week if you have been eating carbs, you will lose up to 4 lbs which will include some water weight (carbs cause you to retain water). Try not to lose more than 2 lbs per week after the first week.
My coach swears by getting yourself lean at the beginning, then increasing your calories so you gain only a pound or so per month. He says most normal sized people, even on AAS, can't gain more than 7 lbs per year. So if you are gaining 1 lb per month, youll put on 7 lbs muscle and 5 lbs fat. You will eventually want to take that fat off once again, so you stay lean. After that, you should repeat the slow gains.
For the more serious clients, he advocates for creating a new, permanent diet, where you are neither bulking or cutting, just trying to put on muscle slowly, while not putting on much fat. When it comes time to lose the fat, you can do a slow cut over several weeks or you can do a fast cut over a couple of weeks, depending on your goals and needs.