Need Advice on building a web service

Hi all, I have been lurking for a while. This is my first post - please be gentle with me. I am a Soccer Coach, and I'd like to build an open source archive of exercises. I have some experience with databases and taxonomy. Nothing though with images. Each exercise would need at least one image showing the layout. I'd like to record the elements on that image. Would HTML5 and Canvas be a good solution? There are thousands of coaching exercises freely available. We desperately need a way to organize them. Thanks John