Make sure to ask complete questions about your vacation time including how much time you get, how you accrue that time, what guidelines there are for scheduling, etc.
Leave policies vary across different organizations; however they usually include one or more of the following: sick leave, vacation, personal time.
Vacation is earned and is expected to be used. In other words, once it’s on the books you should be able to take it
While sick, vacation, and "personal" time is important, it’s also important to remember/review what paid Holidays are observed as well. Those too are inclusive to the total paid time off offered by the company.