Oh you’ve done it now… 
Note that the below are all very much OPTIONAL flavour. Things to help you flesh out your characters etc before you hit the field. I do advise having a think on them though, even if your thought is (not right now, thanks).
A few things to consider re a new Dawnish House:
- The look. Colour scheme, heraldry, any motifs. Examples:
House Tallstag, a silver stag on green.
House Mortere, a golden hourglass on black and red.
House de Rondell, silver gryphon on blue, with three silver crescents
…and so on, dozens of them. I’ve been playing for years and can’t keep track of them all…
Houses Fawnwood, Gladewarden, Rylas, Vexille, Carsenere, de Acier, Drommond, Rylas, Medwood, Wolfbourne, Veridane, Aurelias… and so on…
A good colour scheme and symbol is great for identifying and tying you together as a group. Late Medieval heraldy is a good source of ideas, I am happy to make suggestions and comparisms.
- In-game location; You’ve got a choice of 4 Dawnish province to be from (We captured the Barrens a couple of years back. It took a LOT. There were whole songbooks written about it, including by me); Astolat, Wierwater, Semmerholm and the Barrens. Where you pick will likely affect you in-game priorities, attitudes and some mechanical effects.
eg:
House Aigh is in Astolat, the ancient heart of Dawn. Their concerns are pushing the prestige of Dawn amongst the nations, doing huge magical things, and collecting mana from the Harps of Astolat (a great work which buffs mana in that province).
House Beah is from the Barrens. They are a new House made of knights settling the border, many retired from the long campaign. They are focussed on fortifying the Barrens, and killing the Druj orcs. They don’t give a damn about politics.
House Siegh is based in northern Semmerholm. They are trying to build a society of wandering knights to patrol the unearthly inland sea of the Semmerlak, to guard against things coming from the depths. They do a lot of trading, have several ships, keep an eye on international politics and staying on good terms with their Varushkan nieghbours.
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As noted above, in game objectives. What do you, as players, want to do? What do you, as a new House, want to get done at Anvil? Go on quests and battles? Trade and network and make friends? Build a power base? I reccomend having some sort of group goal, even if nebulous and long-term. Past examples have included:
(a) Be the biggest naval power in Dawn.
(b) Get our group an artefact magic item.
(c) Make a vast amount of cash
(d) Have really good parties.
(e) Get someone an Imperial “hat” (official position, including Archmage, Ambassador, General, Emperor…)
(f) Muster further support and wieght for our war against [insert enemy here]
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IC and OOC organisation.
In-character: You’re going to be Earl? Grand. Do you have a Seneschal (doing the trading, holding the cash)? It’s a useful role to fill.
Out-of-character: Who’s bringing the group tent (if any)? Who’s planning meeting up, travel, etc? Have you considered a private group to chat about this sort of thing on (eg) Facebook? Any thoughts on buying group kit, making new shinies (a banner, decorations). While you may not need to write up an actual social contract (although I have seen that done), a simple agreement of “our character all start off as friends/family and loyal, okay?” may be worth ticking off.
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This is something I like doing for my Houses (currently on third). Backstory.
How old is the House, and what were they doing at that point, or this? Did they get involved in that issue, or site it out?
What do their lands look like, do you feel like drawing up a map? (this is all entirely cosmetic fluff, but can be fun to establish things)
I am a fluffsmith, and will cheerfully write your House a backstory tied into the setting if given age, location and attitude…
This is a layer of detail that is WAAAY more than necessary, and beyond many groups currently in play. But, as noted, can be fun 
I am happy to answer further questions… luckily you have plenty of time before your debut next year… oh, and you’ll be joining us at the new site! Have you heard about that?