Supports are useful both to help the carry farm and to deny farm to the enemy heroes. Which one you prioritize depends on the team setup and strategy. A somewhat common lane setup is a defensive trilane, where mid and hard lanes are soloed, one support will babysit the carry and pull jungle creeps into lane to deny and push the lane back, while the other support will harass and lurk around to force the enemy(s) to hang back, missing out on exp and gold. Another thing I like to do is roam, which means I don't take a lane at all, but I pick a hero with good level 1 or 2 ganking skills and just run around the map looking for kills.
Split pushing is pretty dangerous and requires you to be able to push fast and join up with your team if needed. Keep in mind that it's easy to get killed if you get caught with a disable. Heroes that are good at split pushing include Tinker, Nature's Prophet, Broodmother, and Keeper of the Light.
In general you should gank from mid when you find a good rune and a good opportunity to do it. Some heroes like Invoker need a lot of levels to come online and are better off just farming unless they get a really good opportunity, though.
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