I have a few tips for undead:
1) zombies - fairly useless unit, especially in low point games. They suck...to get them to possibly average you need a corpse cart and a successful spell cast. Since this is fairly easy to stop, that means they suck all the time. You could use them as a large tarpit...in which you need at least 40 models to hold up a decent unit. The banner is actually nice as its one point of free CR and zombies need all they can get. Where they might get interesting is when you add a TK liche priest to the mix. They can boost zombies and add to the unit all in one spell. However, the zombies don't get the extra d6 models due to a TK spell as it only applies to invocation. Still, is probably worth looking into.
2) skeletons - only the VC skels can be raised above starting size and only if you have a master of undead necromancer (its an upgrade). I love the models for the vc skels, not so much for the TK, but that is up to you. A necro with the upgrade might be able to raise more TK skeletons...depends on the exact wording of the upgrade. After reading it, you can raise "skeleton warriors" above their starting size, so that does apply to TK warriors as well as VC. It does not let you raise more archers, horsemen, or chariots though.
As to your list, I would probably drop the skeleton warriors unless you plan on taking master of undead. I would take a LP as a second character. I think the combo of invocation and desert wind, you'll have two ways to add back wounds, plus move models around. That will be tough for opponents to stop both of them.