Practice makes perfect, plus guns and map knowledge. Try youtube faqs for pvp if your new, it should enlighten you on some of the strats. In addition to hand cannons high to medium impact pulse rifles do well as well. Scouts aren't bad on larger maps. Don't try to jump into endgame pvp events like iron banner or trials if your new to pvp tho, you will most likely lose repeatedly and be dissapointed. Practice in regular crucible maps til you feel more confident.