I need help, How can I beat against blood angels?

Everytime when I played against BA I ever lost the game , my army is Imperial Fists and only use Shoots and Vehicules, my partnerts told me: "Only shoot and you will win" but in the practica I can't against Dante and Sanguinari Guard or Lemarte and his Dead CO, Can you explain me how win against BA? (srry I don't know how to speak speak english and much less write :P )