viruses iPhones

iPhones are not really prone to viruses, so the chances of you having a virus are low due to iOS built in security. But if you want to feel safe, you could start anew on your new iPhone, but I don't see any risks of making a backup, as of iPhones are safe and not prone to viruses

One time I was on google and a web page showed up saying you have A virus on your phone to remove it download the latest free security software should I be worried or was it a scam just trying to get me to download a app

That was a scam. Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

There are no viruses on any iOS device.

What makes you think you have a virus on your iPhone?