Got to work out from the centre, taking the big capstone talents to unlock the outer layers.
With your first points you have to start in the centre group of talents. After maxing 3 of the smaller talents you can pick one of the big ones.
After that, you'll have unlocked the next tier ring. From there you'll repeat the process (max 3 small, take the big one) 2 more times. Completing 2 groups in the 2nd ring by taking the big capstone talents will unlock the 3rd ring.
In the 3rd ring you only have to max 2 smaller talents before you can pick the big one.
Hope this helps.