Yep
in order to get in the door of the studio you have to say "I'm so and so and my book is a winner."
These people you DON'T know who tell you this would make a movie, who are they and how did they get a hold of your book?
Are they people that you've just kind of ended up in a group chatting with and the subject came up?
If enough people are telling you it sounds like a movie then the matter deserves some investigation.
Doesn't matter at all which route you end up taking, writing the script yourself or hiring/working with a screenwriter as a partner, you'll need to understand the craft.
SO, start reading.
Loads of scripts, prefferably in the genre of your story.
Read the posts here to get an idea of basic questions and craft issues.
Get some books. The Screenwriter's Bible is a must.
Read the tips over at Bill Martell's scriptsecrets and the WORDPLAY articles.
I hope you have fun, just... enjoy the ride and good luck to you.