I purchased the "for business use" plan, and I added some of my team members to the users page just how it mentioned in the video "Assign a license through Admin Console" and so far, I know that I will need to buy more license per user, however, my question is how can I let then sign in so they can use the applications required for our company?
After you assign a license to a user, they'll receive an email letting them know with instructions on how to get started.
However, they can always go to https://creativecloud.adobe.com and sign in. From here they can access, download, and install the apps they require. Users will need to use the same email address that you've used to add them to the org. Users may need to complete their profile, specify a password etc the first time they sign in.
You'll need to first purchase the licenses and them assign them to the users on your team. See how to Add products or licenses.
Hope this helps!