Do you have any experience with planted tanks at all? If you don't I'd strongly advise gaining that experience without discus in the tank.
There are a number of ways of setting up planted tanks, it really depends on what you are trying to achieve. By that I don't mean "I just want a nice planted tank" either, as they don't happen by accident. What style of planting will you go for? How much light could you have available? Will you use fertilisers? Will you use carbon supplementation either via injected CO2 or liquid supplement? How much time are you prepared to spend maintaining just the plants? Will you have enough circulation?
It is far more complex than just keeping discus as they are easy