Hey Tonno. See my posts on our team forum.
As an alternate, if you need to come into the game, you should be able to come in just like subs do via PBEM. So if for instance Cammorak can't play for a little while, you will take over the nation. We all know things in life can get in the way, having good friends or trustworthy people ready to help out, lined up in advance makes sense. Don't worry Tonno, our team will help you all you need. And while your waiting, alternates can get involved in diplomacy or what have you if they desire. You'll learn a lot by reading the team forums particularly about planning and strategy.
I have never played with Agartha in my life. They are slow in the beginning apparently, but if played correctly, they can be great just like any nation.
Will DrP, Ano, and Squirrel/Chris attempt to spank us? Will they anger Crom? I hope they won't be that foolish. But I know they will be tempted. I say Tonno, let us teach them good, so that they learn their place. So that they avert their eyes when they come into our presence and make obeisance.

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IMPERATOR·CAESAR·LVCIVS·SEPTIMIVS·SEVERVS·PERTINAX·AVGVSTVS·PIVS
Be harmonious, enrich the soldiers, and scorn all other men.
-Emperor Septimius Severus, to his sons shortly before his death, quoted in Dio Cassius (77.15.2).