A reseller here is having a WHM to manage the reseller activities, create new account, modify existing account, suspend, terminate and other tasks.
You login to the WHM >> Account Function >> Create New Account >>>
Fill the form containing the following
Domain
Username
Password
Email
Select package, which you have to create from the beginning before you start on the package key, add package. You can use a default if you want.
Click on create.
Detail of the account will be displayed after the account is created.
The username and password used will be your details to login to the new account.
Note that the domain will be the same domain you have registered and you can register it after this. Point the nameservers from the domain registrar or portal.