Does Practice/Homework Make Perfect?

This is my first year teaching and I am experimenting with my Advanced Microsoft Integrations class that I teach.  I am trying to determine if giving them more homework and practice work will help them master the Microsoft Office Suite.  I find myself struggling to provide a balance for the students.  When working with computers I feel that the more you can do to become familiar with the program the better off the students will be.  

I would love to have some advice from some veteran (or new) teachers on how you balance the load of homework and practice.