Specifically to the "Do you have any recommendations for getting the most out of the tool" question. There have been many questions asked, and discussed, on the forum for suggestions and tips on using virtually every section in ITFlow.
As you work with ITFlow you will start using it one way. I did three times. As you become more familiar with it, and as functionality is added, you may change the way you work with it, how you enter the information. I know I have.
There are a few users on the forum who will offer suggestions and assistance to the best of our ability based on the way we use the software.
Another place to look would be https://docs.itflow.org. For your question https://docs.itflow.org/services. (Not going to lie, Services doesn't make much sense to me but I haven't put in any time in trying to learn how to use it).
I hope your experience with ITFlow is a productive one.