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First of all, there are a couple posts that list guides for all the characters stickied at the top of the page.
I'm pretty new to this game, but I enjoyed TF a lot. Here's what I do...
Cool Down, dodge and Magic penetration runes (Scaling when possible)
heal or rally and the mana spell
I start out with meki pendant, a health potion, and a mana potion. I avoid soloing too, since it seems a high level carry is more important. Harass the other champions with wild cards. If you're good you can hit both of them every time. Use your potions and summoner spells to keep you at high health and mana until you have the gold to make a philosophers stone.
Put your second spell into PAC, but there are really only two uses of that: Gold cards to harass or kill, Spam Blue cards to attack turrets or neutral mobs. Get either neutral buff... they both help a lot. you can solo the dragon around level 10.
Fill out Wild cards (or your ultimate) whenever you can, but just leave one rank in Pick a card. Gate will always help you move around. Gate to the enemy's forest when someone starts running away and hit them with a gold card.
My other Items are as follows: Sorcerers shoes, Sheen - Lichbane, your choice of AP / mana items, but by that time the game's usually set. A blue elixir isn't a bad idea either.