There are some minor mistakes that are peppered throughout the story. The annoying thing about grammar and spelling is it's easy to make a mistake, and even if they are few and far between, they're really noticeable when they happen.
I'll pick on this page
since it has a number of mistakes.
"But, eventually, Gin's fifteen minutes of fame were over." (Removed a comma after "fame" and changed "was" to "were.")
"Even though Gin Carlson's popularity stopped..." (Removed a comma after "popularity" and changed period to ellipsis, because this is an incomplete sentence.)
"His dream of being a hero never did." (Removed a comma after "hero.")
"When Gin finally enrolled in school, he met his first friend, Paul Perez... as he was being bullied by Raymond Jung." (Improper tense use, changed to no longer be a run-on sentence by adding an ellipsis.)
"This angered Gin very much." (Removed comma after "Gin.")
If you aren't doing this already, I have a couple of suggestions to help:
1. If you have Microsoft Word or some other word processor, you can type your script there first, and use the spelling/grammar checker. While these aren't perfect, sometimes they're good enough to get your to notice what you've missed.
OpenOffice is a free word processor that has a spelling/grammar checker, if you need one. If you don't want to install anything, you can do a search for an online spell checker.
2. Read your script out loud. When you read in your head, it can be easy for your mind to auto-correct what a word should
be. Saying it out loud can help you trip over your mistakes, so you can change them to read better.
I would take a break in between working on your page and proof-reading it. Looking at it with a fresh mind will help you catch your mistakes.
All in all, I think you're off to a good start.