Alright then, when does 'prone' go away?

Well, Grymor beat me to this explanation (and did a great job) - I'm just adding more detail...

That depends on the strength of the aspect.  I'll see if I can run through an example (This may just be how our group handles it, but I'm pretty sure it's within the RAW):

Character X wants to knock character Z prone.  This is a contested maneuver - X would use an appropriate skill (Athetics or Might, for example), and Z would get to defend using similar skills.  X has to beat Z to place the aspect "Prone," but how long it lasts depends on the difference in the roll.  A tie places the aspect for 1 exchange, but it's "fragile" - 1 tag and it's gone.  Any shifts in excess of that makes the aspect "sticky" for that many exchanges.  (So if X beats Z by 2, the aspect is sticky and stays for up to 2 exchanges - taggable for free, plus further FP invokes).

Duration depends on Spin.

For Z to get rid of the aspect before it runs out, Z has to do a maneuver of his own - essentially a "counter-maneuver."  In this case, I'd argue that Athletics is really the only viable skill to remove "Prone" (But hey, get creative!)  If no one is around, hit a 3 and you're done.  Of course, if X is still there, it becomes contested (X would want Z to stay prone), with Might or Athletics to "defend."  As long as Z beats X, the aspect goes away.

You may want to "counter-maneuver" with a fragile aspect if you have a chance, but it's much more relevant with sticky aspects.

I showed a variation on this in a webisode on the Dresden Files: Dallas site where "Disarmed" was the aspect in play: http://www.obsidianportal.com/campaign/dfd/adventure-log/warding

On the note of block vs. aspect: if you want to *hold* the person prone, that sounds like a grapple to me, but that just my opinion.

Rather than make our GM toot his own horn, I'd like to direct your attention the most recent "webisode" for his character.  It's quite literally "The Story of the Spell," an extensive scene about putting wards up around his new home, AND he included a breakdown of how the Thaumaturgy works in the system, both from the RAW as well as including our house rules.

http://www.obsidianportal.com/campaign/dfd/adventure-log/an-sc-al-ar-an-t-ortha

Did I mention it's extensive?  Be prepared to sit a spell to read it - it's 8k words before you get to the system breakdown.  Totally worth it, though!

(If you just want to go straight to our interpretation/house rules on Thaum and skip the scene:  http://www.obsidianportal.com/campaign/dfd/wikis/thaumaturgy-houserules - but I don't recommend it. )

I know I'm a couple of days late to the party, but had a couple of thoughts for you.  Great character concept!

• Is there a reason you're jumping straight to the supernatural levels of strength?  You open up 4 refresh by only taking them at Inhuman to start with (and gives your character room to grow/advance).  With the 4 extra refresh, you could tack on recovery as well, and still take a couple of stunts.
• On the topic of stunts, the skill-swapping stunts are a great way to get extra mileage out of a single skill.  Armed Arts lets you pick out two weapons to use with the Fists skill.
• You can also buff up your Fists with the Lethal Weapons stunt(making them an effective Weapon:2), or if you want to bring in more of the St. Patrick curse thing, see if your GM will let you take the Holy Touch power (makes your Fists Weapon:1 against critters with the Faith/Holy catches, in addition to satisfying the catch)
• Agree with the comments that high Might is superfluous with Strength powers in play.
• The Infuriate stunt would be a good spend as well (and allow you to dial back your Intimidate skill)

I won't make any recommendations on your skill tree, because a lot of that will depend on what you do with your refresh.

Just remember that if you've got an Aspect to call on, you don't need to have the skill quite as high.  That can help you to get more skills on the table from the get-go without majorly hamstringing yourself by forgoing +4 and +5 skills.

Anyway, that's my $.02.  Enjoy!

In our campaign (Dresden Files: Dallas), our GM borrowed from various Asian mythologies to come up with his version of the Jade Court, and it's awesomely creepy and way different than the other flavors of vampire:

http://www.obsidianportal.com/campaign/dfd/wikis/jade-court

Anyway, we're all open to other groups utilizing our content if you like it, so feel free to poke around (and if you like/use the content, be sure to favorite the campaign - we're pretty proud of the work we've done as a group).