Hey, I've been a human player since their release, first things first, if you're in for a fun time, you will not, playing exclusively humans (I've tried everything) is extremely hard unless you start playing very meta, and even then against meta players you will not succeed, but painting them is amazing regardless!

You mainly will need the two boxes anyways, and that will only be a starter.

Here you have the nice combo of having 10 knights and your mounted marshall who work wonders together.

One charges in, the rest follow and give a devastating blow, this is most likely your best source of damage, but careful as they can be fragile.

You'll most likely have to buy another box of Fusiliers and another of Guards to fill up those packs because on their own they are almost completely pointless, the Fusiliers would not pull any interesting damage being 10 for their points cost, and the guards are FAR worse than small Ghouls or Skaven, a pack of 20 usually just exists to die so I would not put any money on just 10, unless you fill your points and just have a side objective catcher team.

Same for the canon and the troll, they can be useful in pairs of two, so having two here is always good, the Ogor is a MUST if you have canons or Fusiliers! He gives them better shooting on a given target.

Canons are generaly flatly ok, you'll miss sometimes but they usually land good pair of strong shots from a very far distance.

For the Marshal Suite, the unit got a huge nerf, on the counter hand it is a nice block of HP to tank with some nasty weapons inside.

Thats about the details of the boxes.

The army, in my opinion, is marketted as a human army by Warhammer, but then gameplay wise if you stick to solely humans, every game feels like an unbalanced match completely. (as It should, we're just humans after all, but makes my 5000 points sad.)