The annual payment can be made using Campus Parent Portal and selecting Fees. (more info)
Students are responsible for the general care and protection of the Chromebook they have been issued. The DLE agreement form outlines the expectations for students' Chromebook use. (form)
Yes, and no. For example, your wireless printer at home may have a dedicated email address that will print any attachments sent to the printer.
You cannot, however, print to your school's networked printers. To print at school, users can log into a desktop computer. The media center, for example, has several for students to access.
Use the official Google Chromebook Help Center for additional support.