Welcome to Janna, dominion style. Janna is one of the best survivable and fasted champions around. She has great capturing control in dominion.

CD Runes- With her CD runes, it provides Janna with faster recharge allowing for easier get away and more defending ability.

Mp5 Seals - I gave her Mp5 runes to allow more mana regen on the go, its nice to have more mana after you escape. Otherwise I'd go with dodge or health seals.

Health Quint - Health quins for more health so you don't die as easy.

Utility 16
Defense 14

With this you got the +3% speed boost and gives you a huge defense and magic resist boost with another health boost.

Boots of Swiftness - Best speed while running to cap and while being chased. Obvious survival choice.

Priscilla's Blessing - An obvious choice if your going to cap, it almost feels like 50% faster but it is a must!

Force of Nature - Huge magic resist and healing. Awesome item.

Guardian Angel - More Resist, + a Pheonix Down! It is huge, with this... you are not gonna die easily.

Odin's Vial - Well this last item is really your choice I choose this for the nice AoE dmg you can help defend or finish anyone off with.

Spirit Visage - Awesome item, even more regen... with health and magic resist.

If you feel like adapting to the game, a thornmail and Frozen Heart may be substituted.

Zephyr... max it asap, it gives you a very nice speed boost and a very nice snare
Eye of the Storm is the next skill you will want to max, with dmg absorption, it can be a life saver.
Howling Gale, with one point @ lvl 3, you provide your self with a knock up which can be a huge difference. Last skill you want to max because it is not needed for dmg, but only for its knock-up. So you only need the first level @ 3.

Best*
A huge speed boost, with a mastery point in utility... it provides you with a faster getaway and gets you to your capture point faster.
The best spell you could equipt if your going to cap with a clean getaway. Since Janna is one of the squishier speed cappers, its lets you do your job.

Good*
Could also be in the Best category, but this only provides you with 1 dmg reduction + slow for a short amount of time. Not as good as having a cleanse with ghost.
Also a very nice skill, provides easy juking and escape but you don't need a flash when your a fast Janna that can Juke easy mode.

Pros-
Very Fast
Good Survival
Lots of Snare

Cons-
One of the squishy speed cappers

You are there to provide fast back captures for your team, as well as defend capture points. If your team can delay them and keep them occupied... then your capturing is just easy mode, not that you need your team for this ;D.

Remember there are lots of bushes in the middle, speed boosts, and health buffs. Abuse them, they are there for a reason... so use it to your advantage. Juke'ing is your friend!