Honestly, you're better off sticking to an outfit that is focused on Planetside 2 itself. I learned this after playing with they guys I played ARMA 2 with, and after they got bored of it and stopped playing I was left with an outfit that was basically dead so I stopped playing as well. If you stick with an outfit with people who are mostly interested in Planetside 2 as their 'go-to' game, as it were, then you're less likely to run into a problem like that, and you're more likely going to have leadership that knows what they are doing.
It's nice to have us play together, and I play NC on Waterson myself, but you're better off joining squads and platoons from outfits that are more dedicated to the game.
Speaking of which, if you play on Waterson and for some raisins want to be adding me to your friend list, my name is
Zulban.
(I always get confused and think I play on Mattherson.)
Regarding the Carnage AR... it's not a direct upgrade from the Gauss rifle. I like the Gauss rifle actually, and use the Gauss S a lot because it's pretty good at range and its rate of fire and damage is high enough to be a little competitive at shorter ranges. Gauss rifle is a very good weapon for them to start you out with, probably one of the best default NC weapons for a beginner. You also have to consider horizontal recoil, many weapons in the game will have <- or -> recoil, which basically means the weapon will pull to the left or right respectively when you fire, however some weapons have <-> recoil which means that firing your weapon has an equal chance of making the weapon kick left or right, which is much harder to compensate for. Gauss rifle has -> recoil, while most default NC weapons are <->. The Carnage AR is <-> which makes it harder to control than the gauss rifle, especially with the increased rate of fire. An easier to control weapon would be the GR-22, which has a -> recoil pattern (and slightly less horizontal recoil than the carnage) with an increased rate of fire but worse reload times. I'm thinking of picking the GR-22 up to give it a try. I just wish that recoil patterns and values would be displayed on the in-game weapon comparisons because the whole reason I got the Carnage was for close range engagements and was only going by the damage values and reload speed, not the information that is hidden from you.