There two ways -
1. By creating a business page - for a brand / service, you will be prompted to select when creating a page.
2. By creating a group.
A business page is more preferred as -
- You can boost your posts.
- You can share your posts.
- You can get insights about the reach and the engagements to your posts.
- The various options available in the page to create advertisements.
I prefer and use Face Book pages [ 3 of my own and manage two for my client ].