As this site is just for your team to use, you'll want to make it private so that only logged in users can access it. You'll also need to make some changes to the discussion settings so that logged in members can add comments.
First, let's make sure that the site doesn't get picked up by search engines:
Go to Settings | Reading.
Check the Search Engine Visibility box, as shown in the following screenshot:
Fig 8.10: The Reading Settings screen
Click on the Save Changes button.
Now search engines will be discouraged from finding your site; this makes it less likely that people who shouldn't have access to your site will stumble upon it.