Okay, we're going to do two steps here; do A, then B:

.......

A)  CULTURE PLACEMENT

So, pre-history goes on for however long, with various lifestyles and proto-cultures getting a try (looks like the original Striga had a pretty good run at it, too). Out of this, five patterns for living will be the most successful - the cultures we're about to build.

Now, we want a good spread of "How many Kiths in a culture at its foundation", so let's use that as our springboard. The spread will be:

1x - Culture with one founding kith
2x - Culture with two founding kiths
2x - Culture with three founding kiths

Note that the fact that that a kith is *represented* in a culture doesn't necessarily make it *common;* demographics can be pretty skewed.  So, pick a map location, and declare how many Kiths (and which ones) are in the culture that is being founded there, and what they are - keeping to that spread above.  A format for you:

A1: Culture with two kiths: Abratu, Jotnar.

(The order of kith listing IS demographics: Abratu, Jotnar = More Abratu than Jotnar)

Try to aim for mostly landscapes and Kiths you didn't place, but that's relatively relaxed; just, don't be hiding in a corner with your toys.

Also try to spread these out a bit, if possible; look where others are founding.

...............

B)  MATERIAL CULTURE

Grab a culture sheet or just a piece of paper and sketch out your culture following the book right up to, but not including, language; stop there.

For subsistences, use one from each of your founding kiths, and then add one more (yes, this means cultures with more kiths get more subsistences).

Don't get into heavy detail with it yet - post the fast version up, and if there's too much overlap between any of them, or something like that, we can correct it before you're too set on the results.