I don't know nearly as much about it as I'd like but was also decently interested in game writing/narrative a short while back and picked up this book . It taught me a lot about work in the field and includes a lot of tips and info that I found pretty valuable and interesting. There's even some sample scripts to show format and short exercises throughout the chapters. I misplaced my copy otherwise I'd go into more detail but you can take a look on Amazon anyway.
I'm sure there are better books out there and doubtlessly info online but something like that could be a good starting point.
But hell, if you figure out how to work RPG maker, definitely go for it, having something to present to display your work/writing is always a great idea if you do want to seek out a team.
Good luck with your ventures, bud !