I started playing Dota 2 as a Support hero. Disruptor because I liked his 4th skill. I used to play some bot fights, but the fact that they all would escape when their health is low and I've got everyone in the barrier made me hate it.
So yeah, that was when I tried to play a multiplayer match. And it turned out well. A guy taught me where to place Wards (Alt+click), and I was good at map reading. Always keep 600 golds for Wards (Sentry and Observer).
Needless to say, at first I didn't know how to buy a Courier. I learned it by accident.
But I do agree that supporting isn't healing and stuff. You have to read your own team and enemies' movements to help in the time of needs.
I've failed a lot of times as well, as I couldn't farm enough to
buy team items. And sometimes emotions get in your way of supporting. Gah, that Axe wasn't nice to me, I'll let him get killed for revenge. No, never do that. You've picked a support. Supporting your team is your duty.