RE: calendars
Hi Sharon
Thanks for your question - from the Tools menu in Gantt chart view click on change working time... From this dialogue box you can set working and non working days for your calendars as well as create new calendars.
To choose a calendar to apply to your entire project go to the Project menu then Project information and choose the calendar on which you would like to base your project.
I hope this answers your question - do let us know if you need any further information.
Kind regards,
Andrew