Seems more casual than krumpy. You can take two CADs and your list seems legal.
If you want competitive advice, there's two ways to go about it. First thing to know are some key competition concepts like
MSU (Multiple small units, good at capturing objectives and more survivable vs enemy fire.), model count, (horde lists) and min/max (Take the bare minimum to get a legal list, then max the amount of point effective units.)
So for orks, the points effective units are tankbustas,
MANz, warbikes, deffkoptas, lobbas/
KMKs, and lootas. Your min units can be either boyz or grots depending on what you want to do. The two ways to build a competitive ork list are horde or speed. Before I go into either, let me just say I'd recommend cutting the shootas on the boyz, the tankbusta nob, all the big shootas, the
MANz's battlewagon, and the stormboyz. Shootas are okay if you're putting 20 in a battlewagon for a mobile gun platform, or if you have a unit or two with them out of 6 boyz units. The main purpose of the boyz is to tarpit an enemy and provide a bullet shield for the Nobz, who should have
PKs in almost all cases. It's not that shootas can't be effective in killing enemies, it's just cost ineffective for soething they'd be slighty below average at, at best. Every big shoota taken is a wasted opportunity to take a rokkit launcha, the real backbone of ork dakka. The tankbustas should be
MSU'd to better split their fire and reduce incoming causalities. (If an enemy unit causes 15 wounds to a unit of fifteen, that's bad. If that same enemy unit is forced to deal 15 wounds to three different five man units, it's good for you. Nob isn't needed really in this case, they probably won't survive the shooting at all, let alone to make a moral test. Conversely, if you have to blow up 3 rhinos, it's better to have 3 units of five than one unit of 15 so they can mix & match their targets.) Trukks and
MANz are a match made in heaven. Blasts the
MANz 24" and if the trukk blows up, 2+ save! who cares, they're getting out anyway. Best thing to do is park them 1" from the enemy and dare him to to. (He can't split a units fire between the transport and the boyz forced to disembark it if it dies and the unit still has weapons left. He can try and run but 6"+6"+2d6" > 6"+d6" so he's not going far.) The battlewagon is much, much slower, they'll keep your
MANz out of
CC for at least twice as long, reducing the effectiveness of the
MANz. Stormboyz are just too damn easy to shoot for how expensive they are, warbikes and deffkoptas are far superior choices.
Just an aside, you did
HQ well. Wargear for the warboss is premium, painboys are a solid choice. You took tankbustas,
MANz, mek gunz, and lootas so you know what's competitive, even if they need to be refined slightly. So good job on those things!
A horde version of your list would take at least 80 orks, mostly regular boyz on foot. The idea is that there's so many boyz the opponent's shooting is ineffective. What's a strength D shot to 100 orks? Nothing. Mix in the above point effective units for flavour (Mek gunz, lootas, and tankbustas especially here), and look into a green tide or waaagh band formation for the ability to declare multiple WAAAGHS, allowing you to run and charge on your turn,even give some weapons additional shots. You could mix this style with a blitz brigade formation which gives you five battlewagons, which would fit 100 boyz inside.
CAD is a good formation too though, objective secure on your horde could win you a lot of games without even killing an enemy unit.
A speed unit would see you with either minimum grot squads for troops, a couple boyz squads in trukks (Not really a good combo due to their ineffective size and lack of protection from getting blown up by their own trukk.), or taking a
FW special character named Zhadsnark to make warbikes a troop choice(The best choice.). In either case, you want at least one larger warbike unit to attach multiple characters to (mine has 2 warbosses,a nob, and a painboy for example!), forming a "death star". The special character will give that unit scout and a +1 to jink (Up to 2+ jink save in the right conditions!) so definitely worth looking into. You want to max tankbustas, warbikes, and
MANz here. Trukks for the
MANz and bustas are a must. Bullyboy formation is worth looking into. Grab a lot of bikers for the bikerstar, but the other biker units should be the min 3 bikes, no nob set up. Combined with
CAD will give ya objective secured 18" move bikes to snag objectives away from your opponent. Even a three man unit is pretty much as dakka-y as a dakkajet for less than half the cost and a better jink save. Stormboyz are still points inefficient, but if you want to use them it's here. Bikes as troops means they have all the
FA slots they need. Still, it would be better to take 3 units of 5 than one of 15 for the reasons I've gotten into earlier.
Basically make sure your army is moving at the same speed. None of this half fast half slow stuff, your opponent will be able to focus fire the most pressing threats at a time. You want to overwhelm their shooting, so go all in on one or the other. Don't let him deal with you in waves.
If you aren't too interested in competition, then ignore all this! And maybe you should ignore the competitive angle while you're starting out. Your list as is has lots of varied units and would be a lot of fun with all the different things going on. Competitive lists are less fun, less varied, more spam. Maybe just go for fun while you're getting back into it and worry about this stuff later. I don't mean this to be dumping on your army list, consider this a freeing moment, don't worry about the competitive constraints when you were making this list, just go for the units you like the look of. But if you were considering this a "competitive list", well, it's better for me to break it to you here than you finding out yourself after dumping a ton of time, effort, and money into it. It's not very "competitive". It can be, if that's what you really want.
E: Oh and here's a database of formations, detachments, and tournament lists to look at if it helps:
http://bloodofkittens.com/formation-compendium-2/
