How to use Apple Music family plan
If I subscribe to Apple Music family plan how do I share with my family? Will sharing the family plan download all of my pictures and music onto their phone?
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You need to create a Family Group to share the Apple Music Family Plan as explained in the support document you came from and invite your family member's to it.
About Family subscriptions and Family Sharing
To use a Family subscription with other people in your family, set up Family Sharing using a supported device. When you set up Family Sharing, you become the family organizer. If you don't want to be the family organizer, ask someone else to set up Family Sharing.
If you've already set up Family Sharing and joined Apple Music with a Family subscription, you can add new people by inviting them to be a part of your family group.
Creating a family group will not download any music or share your photos to your family's devices. They will gain access to the Apple Music Family Plan, but the music libraries will remain separate and no photos are actually shared unless you set up a shared album and manually select photos to share.
See here for how to setup Family Sharing and invite your family to it: Set up Family Sharing - Apple Support