Congrats on your purchase! Should be an awesome tube.
As for your question, it should be a pretty simple solution--just a shroud and a mount.
Tons of options there. From simple, cost-effective ones, to "how much do you care to spend".
Since you ordered the basic kit, it does some with an arm. Not an best one, but one that works pretty good, especially as you get into night vision.
A good starting place would be an Ops Core
shroud. It will mount easily to the nightcap. As for mounts, you can go from a USGI
Rhino/
Rhino 2 mount to something like a
Wilcox G11. If you want to change your arm to something that uses a dovetail, your options open quite a bit.
I am certain that others will chime in here with options and opinions too. You really do have a wide variety of choices.
Good luck!