A good cage design will help control most of the seed, discarded fruit and veggie mess. This is the one thing you have to learn to live with if you are going to be happy with the newest member of the family. Parrots are very wasteful when they eat. Talking Talking is another part of living with birds. Alot of parrots can learn to mimic words and sounds.
Some species are better than others.
Never purchase a parrot just for the talking ability of the species. Many parrots may never learn to talk. Think of it as a bonus if your bird does learn to talk and mimic sounds. You and your bird will be happier for this way of thinking. If your bird does learn to talk, you might find that they learn to respond at the appropriate times.