Support is far more a play style than a spec unless you are willing to run TE/RA or RA/TE. Maybe you might want to grab 10 Cut and TB, but they really aren't going to make you much better over just getting damage skills.
Your goal should be to make it as easy as possible for everyone else to do their job while you do as much damage as you can. The closest you can get to 'no damage at all' would be a TE with WB and you'll still have to know where to aim. Only casting Resta and Buffs is basically leech mode.
tl;dr: You can play support just fine even as a lightning+convert FO/TE. Why don't you get used to pulling your own weight as one before you try to min max your spec? Then you'll at least know what you are looking for in the tree.
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