We aren't going to go into the specifics of scanning and creating web graphics here, although ITDC staff would be happy to teach you to do this. Don't think about design, think about usability . Students are not coming to your pages to fulfill an aesthetic need, but to access material and information for learning. As a web-site creator, you are also a graphic designer.
Good artists borrow, great artists steal .
Surf around, find things you like from other web sites, then view the source and learn to do something similar yourself. Initial investment yields long-term dividends. The most time-consuming part of site building comes at the beginning, when you are planning how the elements will work together. If you don't take enough time at that stage, you will spend a LOT of time backtracking and making changes. It's not print.