Greetings! My name is Rog (of course) and I am a Premium Content Creator here on Roll20!
I like playing Pathfinder with my awesome group! They are awesome because not only are they dedicated players, but they love telling their own stories and give me plenty of clues as to what opportunity/horror to throw at them next!
The way I run my campaign is this: It's a four-wheel-drive on rails. I prepare a nice story, but I am ok with the party going wild and going elsewhere. You get the best storytelling when the GM and the party meet half-way!
My advice to new GMs is this: Just do it. Even if you don't know the interface. Even if you don't know the system. If you have a story that you would like to tell, and this network is the best venue, then just do it. Start a campaign. Put it on LFG, and up front in the description LET EVERYONE KNOW that you are a new GM and the good players will help you any way you need!