start with heroes with relatively easy-to-use skills or more passive skills
e.g. moon queen, swiftblade, nh/scout,
as you start to progress from complete noob to a nub, try using heroes with escape mechanisms
e.g. blinkers - hag, magebane, or any hero with skills that allow you to move away from the enemy fast
as you start to realize the game revolves around the support heroes, you can try playing support