For this first turn only, all territories cost one regardless of size, except if they're far away, in which case the normal distance penalty applies.
Therefore, for 8 points, you can claim 8 Tibetan provinces and 1 French, 6 Tibetan and 2 French, etc.
Since you already have 7 provinces in Tibet, claiming 2 more would mean you've spent 9 points; you need two points to claim a far-off territory, so no French territories would be able to be claimed.