Previous:  12. Tweak your arrangement.
13. Action: Print music for your band of the arrangement you just wrote.
Ingredients: All of the work you have just done.
Explanation: An arrangement only works if it can be performed. Think practically about what each player needs to create their part. Put it in writing. For some, it will simply be a list of chords or a lead sheet. For others, it may be a full musical score.
Many an arrangement has disappeared when the recording began. Usually that's not a good thing. At the very least, make sure that the players have the roadmap when they record. If you are going to be paying for studio time, think of how much money you'll save is each player nails their part in one or two takes. The more specific the material you give them, the faster and better they will play.
You may also consider creating a CD or tape of their parts so that they can practic at home.
Result: The band parts music is done and printed.
 
Next: 14. Practice your vocals.