Wrapping a Spiral Perm
A: Generally speaking, it really depends on the tool being used. With the more traditional soft bend and circle tools, the hair is usually wound in such a way around the tool that the tool is fastened with the join toward the side or the bottom.
The important factors in wrapping the hair are that the hair be kept clear of the fastening mechanism to prevent snags and damage to the hair and that the hair be kept neat and orderly in the wrapped state. If these two conditions are met, the method of achieving them can vary wildly depending on the shape and size of the base sections and slices being wrapped - not to mention the desired finished look.
Your best option is to practice with the tools you have available (or the tools you intend to use most with clients and in whatever other settings you will use them in) and determine what method of wrapping and securing the tools is most comfortable for you and your client. The more at ease you are with the method you use, the faster and more precise your wrapping will be, and the better your perms will look as a result.
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See also:
How to wrap a spiral perm
How do you section off the hair for a spiral perm?
Can you wrap a spiral perm with normal perming rods?
How can I wrap a spiral perm using perm rods with a spiral groove?