Shipka posted a lot of useful stuff 4-5 years ago and that, plus a holiday in the Balkans got me into the period. The loveliness of the Steve Barber range helped too. Although the range isn’t that big, you can boost numbers from other manufacturers ranges, Napoleon in Egypt being pretty useful.
There are a few books on the progress of the War, but not much, at least in English, on the sort of things you need for putting together little lead armies.