but wondering where are the British?
As to our ESR Box Sets, unfortunately at the moment the British are with the Spanish, Portuguese, Polish, Saxons, etc… in that they aren't released yet – but we do plan to remedy that!
Any recommendations for a which starter box to get first?
Well, if you can't decide… then definitely one of each! :-p Honestly, it comes down to whichever French opponent you prefer, each one fights a bit differently. The Russians lean towards the defensive as they are likely to have Stoic [ST] Formations. The Austrians are a nice center of the road Army, little about them is outstanding but nothing about them is really bad. The late war Prussians are a curious mix, they have troops from all parts of the quality spectrum.
All of our ESR Campaign Guides do give a bit of the "plot" of the campaign and each engagement, so that might be a good place to start.