World of Warcraft

Ok let me begin by saying I'm an extreme casual. I only get to play 1-2 hours maybe 4-5 days a week. Because of my limited time I don't do any modern expansion dungeons or raids.

I heard about this gear upgrade system. I see where everyone is talking about upgrading veteran and above, but I don't see any information on upgrading adventure. Does anyone have any good info on where I can get that level of gear and what I need to do to upgrade it?