Many scholarships and awards require a letter of reference from one or more people. It is wise to ask one of your professors from the School of Library and Information Studies to serve as a reference, but remember to give them lots of notice. They will be happy to help you in this regard. Remember while they have access to your student file for information to include in your reference letter, you can help by providing specific points that you would like them to mention. Later on of course, you are free to ask any of your professors.
Professors are quite accustomed to students asking for references, so feel free to ask.
For example, you may be asked to enroll in a certain course, or write a report on your experiences. Again, this really depends on the scholarship. Each one is different. Unless specified in the application, grades are not an important factor. For the most part, organizations want to provide scholarships to people who are genuinely interested in the profession, and to whom the money will be especially helpful.