Word of advice here: Get your Green Stuff/Milliput and your pin vise ready. Some of the earlier Skorne models (particuarly the warbeasts) are abominations to put together. You'll need to do a fair amount of green stuffing on all the Titans. There are fair amound of seams as well, and I find that Milliput works best here, as you can get it nice and wet, turn it into a paste, and fill the gaps, toothpaste-style, that way.
For your pin vise, make sure you have a 1/32 bit, as you'll certainly want it for the back flags on the Cataphracts. The pinning on these guys reminds of the pinning I had to do with my Rackham Tir-Na-Bor dwarves.
Also...since no one has said it yet: Be prepared to lose. A lot. Until you learn all of your syndegies and those of your opponents, you will lose. It is the nature of the beast that is Warmahordes. Stick with it though. There's a lot of game there.