It's what Ray said above with any kind of plant, not just orchids. It takes experience to figure out how to select a pot (size, material, how many holes) and medium for any plant.
If there is an orchid society near you, you can learn a lot from them.
For now I would recommend reading a lot about these different kinds of orchids. Most people who used the same pots and medium for these three kinds of orchids would water them very differently. The Miltoniopsis need to say moist. Many people recommend Phals dry out between waterings. And there are a lot of different Dendrobiums that need differing care.
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