Let it sit for a while. Re-read your script. Now is the time to revise.
Revision is a very important process.
You don't want to send your first draft off to the script reader. You might even want to get a second opinion. DO NOT post your script to any public bulletin boards or download libraries. The producers want fresh, original material, and that means that they don't want your script if everyone's read it. Don't let this turn you off from having friends read it over.