Just about everyone could use a storage she at some point in their life. You could opt to purchase one that is a prefab vinyl job, buy one from a local shed company where they will drive up and drop it in your yard, or build one yourself.
If you are like me, you will probably build one yourself. For many, this project will take weeks to complete. Delays in outdoor building projects can come from your schedule or weather. This shed will allow you to use inexpensive material and it will be something that you can build in your garage on rainy days. The shed is essentially a series of panels that are then assembled. I build a playhouse with my son many years ago with this technique. It took up one side of the garage for a couple of weeks, but it was a fun (and dry) project that was built in a controlled environment.
This shed plan comes from The Family Handyman. I love their projects since they are generally very thorough. The plans come with a full material list and include an exploded view drawing (the most helpful part on a job site).
Good luck with your own shed. Have fun and stay safe.