I want to broadcast my weather station to Ham Weather, I'm very new here. Will I now need to buy weatherlink? I have a Davis Wireless Vantage Pro2 #6152
Please tell me what I need to get hookup and start seeing it on the internet.
First, if you really really want to use "HAMweather"
http://www.hamweather.com/, then ignore the rest of this answer and go hire the folks at HAMweather to help you.
But if you are asking for the easiest, most straightforward way to publish your weather data 24/7 to "the internet", perhaps including Weather Underground, and CWOP/APRS, and other places, then:
I'll make a lot of assumptions here. I assume you have a connection to the internet, which includes a router.
You must have a connection to your VP2 console, a thing usually called a "logger". For simplicity, purchase the Davis WeatherLinkIP. That connects to your console and your router, and automatically sends data to the WeatherLink.com weather site, from where it may be also routed to a few other places.
That solution is almost "plug and play".
There are lots of other ways, all of which are more complicated (and some of which are less expensive). I'm confident that other folks will describe those and try to say they are not more complicated.