Just a quick update;

The character concept as I have it now, is a new Knight of the Summer Court (the game may be set before the dresden files)
He's lived a little amongst the fae, but chose to be a mortal, I'm not sure when. He's very new to the position, at 6 refresh, he's learning the magic
and polishing his sword play, but he needs more real combat experience.

He keeps his word, or at least the letter of it, as a side affect of being friendly with the fae, although his naivety towards mortals makes him more inclined to keep to the spirit in those circumstances. He is an altruist, and I'm sure it will be exploited soon enough. As  consequence of being a new Knight, he doesn't have a good idea of how powerful he is, or where he ranks in supernatural circles, leading to bouts of over and under confidence.

I'm starting to think his mother was a noble amongst the sidhe who look a lover, probably a mortal warrior. Maybe even a wizard. In any case, they're both dead, and he stumbled through life as a barman and drifter, mainly with other changelings. He's always gravitated to the courts and occasionally received small kindnesses, in repayment for debts owed to his mother, or out of respect for her. This is probably what created his somewhat misplaced altruism.

The only thing I don't know is what elevated him to such status that a job as Knight was feasible...

Aww, man, now I want to write up a character that has that aspect, and another named "and miles to go before I sleep".

Once we pass our first major milestone, I'm swapping "I'm new at this" for "and miles to go before I sleep"

I've been a GM and a player of different games for more than a decade and I've read all the Dresden books, but this still bothers me.
I may be playing one in an upcoming game and I'm not sure how to roleplay someone who lives amongst mortals and fae, who has obligations and travels, but also has free will.
Who can lie, but is often as squirrelly as the sidhe. The fact that all the Knights seem to be different doesn't help. Fix in particular seems to have an odd way of talking, one moment mortal and informal, then when important business comes up, talks like an etiquette handbook on the fae, only less clear.

So, how should I talk and act as a Champion of Summer or Winter?

Perhaps you could achieve the affect you want via a talisman of some kind? Thaumaturgy bound within a one use item?

Noob questions, awayyyy!

What rote spells get you the most 'bang for your buck' so to speak?
I've heard that attacks aren't always the best method, but what do that leave?

I've got;
Great Conviction (+4)
Great Discipline (+4)
Good Lore (+3)
Air, Water and Spirit as elements.

Utterly lost on what spells to build, so any help would be appreciated!

I think he crosses the line when he says healing, as its always been bloody difficult in Dresdenfiles to heal anyone, hence how most healers have doctorates and medical degrees (from some point in history). When fire would work, then that's ok like the others said; hypothermia, wart removal, etc.

But attempted healing would do far more harm than good in a majority of the situations I can think of.