Hello Mae,
To create email addresses, please do this:
1) Log in to your cpanel (yourdomain.ext:2083 for a secure connection).
2) In the email section, click Manage Accounts
3)Then click Add account and enter the desired name and password.
As for your question about what those emails are that you see.
I assume you clicked the default address which is automatically created.
All these emails are probably spam, but take a quick look at their subject lines before you delete them.
To not get any emails than to those email addresses you have created:
1) In the email section in cpanel, click default address
2) Then click "Set default address
3) Enter :fail: in the field after the one saying Send all unrouted e-mail for:
As for how to create a link on your website. There are various ways to do this. Some of us use some sort of form on our websites where our addresses are coded in to the script, while some put the email address like a link. If you do this, you are recommended to obfuscate it. There are severeal threads in the forum explaining how to do both the form way and the link way.
Hope this helps.