write a very basic syntax file

Hello,

I am pretty sure this question has been already asked many times. I
apologize if that is the case.
I have been googling the topic for a while, and the problem is that I
found too many different ways to [theoretically] do it, so I am not
sure which one is the right one.

So let's say I only want to highlight lines starting with char #
(comments) in any file with extension .myfile

I have vim 7.2
I started by adding this line in my ~/.vimrc:

au BufRead,BufNewFile *.myfile setfiletype myfile

And tried to follow this documentation (one of the many):

http://learnvimscriptthehardway.stevelosh.com/chapters/45.html


So I created directory ~/.vim/plugin/syntax/ and file
~/.vim/plugin/syntax/myfile.vim, with content

if exists("b:current_syntax")
finish
endif

echom "Our syntax highlighting code will go here."

let b:current_syntax = "myfile"


And here, to my surprise, now I see the message every time I open ANY
file. So no worth it to keep moving on. I guess my first question is:
where do I exactly set the filetype recognition, and where I should
place the syntax file in such a way it does not mess with other
filetypes?


Thanks a lot in advance.
Cheers,
Jose

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