The more deposition experience you have, the less likely you'll want to script out deposition questions ahead of time. After all, you need to be able to listen to the witness and respond with a new question based on his answer--and you don't know the answer until you ask the question.
For this reason, deposition outlines are often just a list of topics and sub-topics you want to cover with the withess. As you're getting to this point, however, there is nothing wrong with scripting out some of the questions you'll be asking. A principle benefit of this approach is that it will help you to better visualize the deposition process before it happens. Just remember to be flexible enough to set your scripted questions aside at the real deposition when the witness wants to take you off on a tangent that needs to be explored.