Welcome to the forum!
The answer depends on what your knives and needs are. You may want to look at the “Need help picking which kit…” thread…
http://www.wickededgeusa.com/index.php?option=com_kunena&func=view&catid=2&id=4530&Itemid=63
some of this was just discussed. If I was going to add anything, it would be the Micro fine ceramics… I’m finding these stones are great for setting up the edge for the leather, but also as a finishing stone, leaving a crisp edge with some “bite” to it. Other than that, you may want to see what results you’re getting, and then decide from there!
If you have a specific situation, post it, and maybe there’s a more precise answer.
Have fun!