Howdy, and welcome to 5th edition.
My Ork army started as 4
AoBR boxes. I bought two, and traded the marines inside for Orks in two others.
Wound allocation: Defenders assign wounds, and each wound group must spread wounds equally. If I have a group of 10 nobs, and all 10 nobs are equipped differently, I have 10 wound groups. If you do 10 wounds to me, I must assign those 10 wounds equally amongst my wound groups. That means that every nob gets 1 wound. Thus, even if I fail all 10 wounds, you didn't kill anyone, you just wounded all my nobs.
As for your list, let me tell you this: I've typed pages and pages in other peoples' Ork army list threads, and I play mobile orks. Instead of me typing all that again here, check out the first two pages of the Army list section here and read some of what I wrote. It applies to you and will explain tactically why what I'm writing here works. You're going to have to shuck out for a couple of trukks, and do some proxying until you have real models, but that's ok.
HQ1: Warboss, Powerklaw, 'Eavy Armor (90 points)
HQ2: (Proxied) Ghazghkull Thraka (225 points)
Troop 1: 10
AoBR Nobs (troop choice because of your warboss) equipped as follows: (451 points)
1. Painboy
2. Bosspole
3. Waaugh! Banner
4. Powerklaw
5. Powerklaw, Ammo Runt
6. Powerklaw, Kombi-Skorcha
7. Big Choppa
8. Big Choppa, Ammo Runt
9. Big Choppa, Kombi-Skorcha
10. Normal Nob
'Eavy Armor on everyone
Trukk, Red Paint, Reinforced Ram (Ghazghkull is inside with the nobs)
Troop 2: 12 Boyz inside a trukk with Red Paint and Reinforced Ram; Nob with a powerklaw (152 points)
Troop 3: Same (152 points)
Troop 4: Same )152 points)
Troop 5: Same (152 points)
Fast attack 1: 3 Deff Koptas (
TL Rokkits) (135 points)
Fast attack 2: 3 Deff Koptas (
TL Rokkits) (135 points)
That's about the max points that you can make with what you've got - comes out to 1644 points. If you added in a few points (Buzz saw on a couple of Deff Koptas) you could get 1750 points. If you want to kick it down to 1500 points, drop the warboss and it takes you down to 1554; you can combine two boy squads, drop a nob with a
PK to get a foot-slogging unit....there's a lot of proxying to be done regardless. =p