I am looking for a tutorial on making a strategy game. Think of something like Age of Empires or Heroes of Might and Magic III. Anyone have a link?
There is no such tutorial.
Thats work for weeks++ to get even a solid prototype, nothing for a 30 min tutorial 
Oh bummer…not even anything on how to set up the camera?
Well for the very base, look at the showcase board, there is a “community command conquer RTS” project which is source available.
As for setting up the camera generally: you would use the orbit camera script that comes with unity as a base and modify it to limit its vertical rotation (given you allow any at all, otherwise you can remove that whole code that allows rotation :))
Generally, doing such a tutorial isn’t easy as there isn’t 1 RTS camera setup. I know over half a dozen that are fundamentally different and each has another half a dozen or so variations
That you can prolly find in other tutorials. Essentially for an Isometric game, you just need to set up your main camera as “Orthographic” and point is down at an angle of your choice.
There are lots of things to look at that might help. Search for “tiles” and other keywords that might be used in a game like that. Heck, search for RTS. Ultimately you could look at Aron Granbergs A* pathing, but I think you need to get some basics under your belt first. If you’ve not done any of the tutorials from Unity, just burn through a couple to get a feeling for the Unity Editor.