Hi, Luna, and welcome to WriteWords
I think most writers have a fear of beginning, because oyu want it to be 'right' first time, but what you actually get is the 'shitty first draft'. The important bit is the editing/rewriting, where you work on that first rough diamond of a draft, and polish it up into the story you orignially had in your head.
If you need any help in navigating the Site, just give us a shout.
- NaomiM