You'd probably be better off getting the apex version, since most mods coming out these days will be calibrated for that, but there's nothing stopping you from using the regular arma to get your feet under you. The mods you'll need are also handy to have, since they offer a buttload more content than the game itself can generally provide. I'd recommend spending some time with the tutorials and getting practiced at the game, since Arma is one of those games that's easy to learn but hard to master. It's quite nice in that it straddles the line between a sim and a generic shooter, leaning closer toward the sim side of things, though the marksmanship is quite a bit easier than A2's marskmanship.
