1) What game mode you play? Be sure to do not rush, stay behind heavier tanks and use them as cover if needed. Observe and search for move and smoke. If something move or there is a smoke = there is an enemy tank there.
2) As above - if you do not rush, no one will be in your way
Let them scout terrain, you can take care of sniping enemy. No need to sit far away behind front line. Stick with your allies, but do not rush in front of them.
3) Be sure to check your line up. In bottom right corner of tech tree you have got switch [auto/arcade/realistic/simulator], but sure to have it on auto. It will show BR according to your game mode.