How to build my own npm packages?

What I've done so far:

• created a npmjs account
• logged into my account with npm login
• set up a new npm package with npm init
• created index.js
• published with npm publish
• added README.md
• used npm version <update_type> to update and publish again

Now my question is:

How do I test if my package is working correctly? Do I need to create another project and install my package and try it out there? What is the workflow for these things?

Thanks in advance!