Some of the answers I second:
-Don't wait for inspiration. Discipline is the key.
-Put it aside. Read it pretending you've never read it before. Show it to friends whose opinion you respect and who like the kind of thing that this is.
-Read it aloud to yourself because that's the only way to be sure the rhythms of the sentences are OK
-Write whatever way you like. Fiction is made of words on a page; reality is made of something else. It doesn't matter how "real" your story is, or how "made up": what matters is its necessity.
Read some of the advice here.
Here are Ian Rankin’s [full disclosure: I have spoken to him! About a personal matter! He is nice!] rules from the second part of the article:
1 Read lots.
2 Write lots.
3 Learn to be self-critical.
4 Learn what criticism to accept.
5 Be persistent.
6 Have a story worth telling.
7 Don't give up.
8 Know the market.
9 Get lucky.
10 Stay lucky.
Read the rest of the writers' advice here.