Righto, I just purchased the Core/Inquisitors handbook/GM screen.

I intend to get the beastery book next, but after that i'm lost.

any pointers?

Disciples of dark gods gives you good info on enemy groups you can use in your campaign.

Radicals Handbook is for players that want the forbidden powers.

I fully agree with "Disciple of the Dark Gods" it's a great buy for the dark nitty gritty of the Ordos enemy.