I will include models and numbers of models but this is not an army list thread.. I'm just trying to understand how to shove the models I have into detachments/formations or whatever so I'm not looking for any tips for what models I should have etc.

*/disclaimer*

All those months later I'm still trying to understand the whole Detachment and Formation thing.. I kinda took an hiatus from 40K but had to buy the new DA codex so I'm trying to understand things. Even the WH40K rulebook confuses me so I hope you can help me!

What is the difference between Formations and Detachments?

Thanks in advance for your help - even if you don't have the new DA codex helping me with understand how Detachments and Formations work and differ would be much appreciated!

I have models for:

1 Sammel on Sableclaw

1 Librarian Biker

12 Bikers

2 Assault Bikes

2 Land Speeders

10 Deathwing Knights

Now then.. reading the codex I see I can make 2 Ravenwing Attack Squadrons from say, 2 'formations' of 3 bikers, 1 Assault Bike, and 1 Land Speeder.

How does that go into a detachment?

Obviously I'd be going for the Ravenwing Strike Force - how do the formations fit in there if at all? Does one Formation count as 1 Fast Attack? Or would I have to get the 2 Formations, then make a Detachment from Sammael, and the two other Bike Squads?

The Librarian Biker will be left out because he doesn't have the Ravenwing rule..

Where would my Deathwing Knights will go then? I can make a secondary Detachment Deathwing Strike Force? I can include 2 units of 5 Deathwing Knights and would then have to pick another HQ choice with the Deathwing rule right?

I'm just trying to understand those rules. Obviously this army would be Battleforged right?

Thanks!