If you want to learn the basics of creating a database schema (i.e. creating tables, defining relationships, normalization etc), this Lynda (now LinkedIn) course I think is the best for beginners. It does require a subscription to Lynda/LinkedIn to watch which may not be practical.

Here is a video excerpt from the course to give you a flavour of the instructional style:

https://www.youtube.com/watch?v=V5DyvUfsboA