Welcome! All I can add is read the manual (there is a ton of useful info in there about the game and tactics), read through this forum (lots of useful info in the various topics), and if you think you like the game now, just wait until you really learn how to play it
Also, buy the World War 2 version, even if you're not into WW2, as I find it's as fun to play as the Modern version.
Steves308