First of all welcome to SLO.
Right now there's not much to do yet, as NM said.
To "join" a village, simply make a post in the character creation section and state the village you want to join. People post there as a sort of reservation/idea/template for the future.
As for clans and organisations, most of them have a template that you can fill in for application if you wish to join their ranks. Simply look for an organisation that suits either you /or/ your character the best.
And lastly, read up on the FAQ and other important stuff such as natures, villages etc. if you haven't already.
Best of luck and maybe I can call you my fellow villager in the future ^^
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