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Sharing - if you would like a colleague to view your report, ensure it is saved in a public folder that the user has permissions to access, then simply send the URL of the report.
Missing Fields - if you cannot find the field you are looking for and you know is present on the object or parent object, it may be because it has not been added to the Report Type you are using. This can be common with custom fields that have bee been created specifically for your school.
Contact your System Administrator with a link to the report you are working on and the name of the field you would like added.
The Reports System is very powerful - this article covers just the basics, but if you require instruction on how to create more complex reports, please contact your System Administrator.