Okay. One, this isn't the subforum to ask this question in. I'll ask moderation to move this to where it needs to go, if they don't already beat me to it.
Two, to ways you could go about it:
- Train-of-thought writing: Write as you think of it. This is the easiest way to write, but is also prone to plot holes.
- Plotted writing: Write your plot outline first, then write the story. More work involved, but leads to a more cohesive story. As a first-tie writer, I recommend you use this method first.
Now, a playwright once told me, write what you know. Writers (myself included) will also tell you, write what you like. You have an advantage in that you can do both at the same time.
Lastly, don't be afraid to have your story proofread. There are more than a few of us willing to help out there, so jut throw us a PM.