Hey Dean,
The easiest way is to create the form library when you publish your InfoPath form. When you select publish to a sharepoint site, navigate to the site and enter a name for the form library and one will be created automatically. Otherwise is you want to use one you have created in sharepoint, just pick a sample and then overwrite it when you publish it. Publish your template, select Sharepoint, browse to the site, and select an existing formlibrary.
I think there is a way to load forms into SharePoint as an administrator but I would have to research that.