@Potluck
For the description but also other modules, some are not installed,.
You must use the extansions menu in tools to install a new module inside in your application
Hello Reflex,
Welcome on the forum.
To customize your product, you have different option.
1 - use the products attributes (catalog / products attributes). I think it be the best in you case
2 - Extra fields, this apps (not free) allow you to add new fields inside you catalog
3 - Products Specifications (not free) allow you to add differents specifications inside your product description.