I have a lot of crows and squirrels around my house and I would like to know if i could do pest control in town with a pellet gun

The first thing you need to do is to check with the police department in your town to see if it would be legal to use the pellet gun within the city limits. There is a crow hunting season (October 1-January 31) for areas outside of town.  Fox squirrels can be hunted year round...again, outside of city limits.