The AOD rulebook has only tiny changes here and there(
FW was too timid there. Wasted opportunity a bit) so biggest change is change of invisibility to new spell. So that's not top priority. Basically get the army list books and you are good to go.
For army your idea sounds very point heavy. How big army you are planning? That sounds like 3k minimum. Also reavers, while super cool models, are very lackluster. TAKE CARE to not overequip. I did. End result is like 250 pts for 5 guys
With 1 wound. And 3+...
Justaerin are meanwhile pretty good. Less sure about Abbadon as don't have him.
Regular terminators in spartan would be expensive and 1W is bit of a bummer. Consider upping to justaerin if you can. Or just basic tacticals. 20 of those with
CCW, apo and character can be decent.