Are you wanting ideas on how to organize an existing closet to store craft materials? or
Are you wanting ideas on how to build a storage closet for craft items where no closet presently exists?
Here are some ideas: https://www.lifestorage.com/blog/organization/craft-closet-organization/
Here's another suggestion:
Use lots if clear bins.
Having many craft supplies myself I think what helps me is having a specific place for everything, also having supplies you regularly use close together and readily accessible.