From what I have heard Miltoniopsis are a bit difficult because they like it cooler and damp. That being said, I have one and a Nelly Isler (not a Milt, but fairly similar) and both seem quite happy. But then again I specialize in damp, cool weather, unlike Texas.
You should watch out for leaf pleating, since that is a sign of not enough water. I think I would start off treating them like most other oncidium-type (roots are similar) and be careful not to rot the roots through over watering. If the leaves pleat too much (I have a little, but it's pretty minimal), start watering more (assuming roots are good). Since they have pseudobulbs, they ought to give you a little lee-way at the beginning.