Upgrading units

Those numbers are correct. one thing to remember is that youcannot get an MGL if you have a leader already, so once you get him, use him - or just use vets to get to elite.

As to cavs vs. infantry - cavs are cheaper and move faster - until tanks, I usually produce at least 3-1 cavs to infantry. Artillery + cavs means many dead enemy infantry. Being fast, your cavs have a decent change of retreating, instead of dying, which is important to reducing war weariness and keeping your precious troops alive. Cover hurt ones with a couple of infantry, and the AI won't be able to kill them ;)
 
And also after building the MA (Military Acadamy) You get to build free leaders. But you must have had a leader before.
You can still get leaders after building the MA, at least in Conquests--I think it's the same in vanilla/PTW. Also, the MA lets you build armies, not leaders.
 
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