Give it a read.
The British Soldier in the Age of the Horse and Musket
I picked this book up at my local second hand book seller. I paid a miserly $11 for the book which sold for $22.95 in 2002.
I found the book to be easy to read and the style that Richard Holmes uses makes the book a good read. I could prattle on for ages, but I'm still working my way through the book. It has made me look at my Prussians (in 25/28mm scale) again, which will of course make my sparing partner Andrew Ross very happy.
While I'm on the period of Napoleonic's Phil Barker has made available the rules which I use (along with many others). Check the freewargamesrules.co.uk and look for the ones by WRG.