[Samba] newbie help with remote access

[andy flatt]

I have a kurobox that I can access with my in-house network (dynamic
external ip).  I would love to be able to access from my work network
(dynamic external ip) as well as allow my brother a few states away
access it (dynamic external ip).

Where do I start?  Console level control only, no GUI on the kuro.

For those who are kuro savvy, I am running Alan's Mac Friendly version 2.

Thank you.
Andy