Thank you, Paul, for that very kind endorsement. Certainly I welcome any proposals for the series that I edit, which covers 1721-1815. More details here http://www.helion.co.uk/browse-title-series-more/reason-to-revolution-1721-1815.html. Certainly War of 1812 material would be of interest; we don't have anything on that topic signed up so far.
Insofar as advice on how to write/get published is concerned, our proposal guidelines give some idea of the stage we would expect someone to have got to before they make a serious approach to a publisher, which may be useful: http://www.helion.co.uk/HelionProposalGuide.pdf
As Kevin very rightly says, though, writing military history is not going to make your fortune.
Best Wishes, Andrew