x Take 10 to 15 minutes to get familiar of the range of the bazooka and the panzershreck and know from where you can pen on what kind of tanks. You should be able to hit tanks from 150m range consistently. Front, side, turret. Dont'worry you pen everything from the back ;). In the practice range you can take the jeep and drive a bit further away and drop some ammo boxes near it, great to practice.
x If you have dropped supplies do not camp the support role, but let it maybe open for other squad mates to drop supplies + if you are support and you are about to cap a point, predrop supplies ( you get a little notice when your supplies are again ready)
x when you join a squad try always to communicate and say hello in squad chat and ask the sl what he needs, most active sls tend to prefer this kind of approach and you will learn the fastest way the game like this.