These are a few helpful command to add users
FYI, you need to run these in admin for it to work

Add a normal user

net user USERNAMEHERE PASSWORDHERE/ADD /FULLNAME:"FULLNAMEHERE"

Add a normal user w/ password change restrictions
To set restrictions change PASSWORDCHG to yes or no

net user username password /ADD /PASSWORDCHG:Yes

This'll let you add a specified user to the Admin group

net localgroup administrators USERNAMEHERE /add