JTS Napoleon - Where to Start?

[BigDuke66]

Personally I use the 3D view as the normal 2d view makes it sometimes hard for me to tell what direction a unit is facing.
As for mods I can highly recommend all mods by Philippe.

I also recommend to start with a game that covers your favorite battle/campaign, I think that's the best way to get into a series that were so many games have been released.