I don't know if I am in the right place for this question
But
I am in the middle of writing a story and so far I think it is good and want to know if it is good enough to get published and for people to buy it but I don't know what to do.
Who do I send it to?
What do I do?
Can you please help

Best bet is to get it to publishers. One way or the other, they'll let you know if it is good enough. For more info about the industry as a writer, take a look at the Writer's and Artist's Yearbook:

Amazon.co.uk: Writers' and Artists' Yearbook 2008 (Writers' and Artists'): Alexander McCall Smith: Books