Hi granger,
Thanks for posting your question. I'm more than happy to help you today. You'll want to use your TEMP URL to test out your website, prior to changing your nameservers. You can find your TEMP URL in AMP. Here's a link that may help you out:
Using your TEMP URL to test a website
Keep in mind, you do not need to specify the /public_html folder in your URL since this is the doc root for your domain. Simply using your temp url will automatically display your public_html folder by default.
If you need further assistance please feel free to contact us.
Thanks!
Tim S