I hope you have really thought about this and know what you are getting into. You can't really really have a 'community' tank with discus, you have a tank tailored to the needs of the discus and any tank mates that can fit in with this if you have the room.
Juvenile discus should not be kept on their own or in small groups for very long. I would add the other 4 in one go if possible. You'll need to be doing daily water changes, and feeding 4-5 times a day and ideally you'd keep them in a bare bottom tank. 5 adult discus are good for a 55, but if raising juveniles you would want to have more than this as they feel more secure. You'll also want to match the water chemistry of your supplier (may be too late for this...) then adjust if needed. You will find a few people saying discus can be kept in hard water, but you'll find many more saying soft water is a requirement, and from my experience this is true. Be prepared to buy an RO unit if needed.
Don't want this to sound harsh, but discus are very easy to stunt and if that happens they won't live out their 10 year life span. IMO you may be making a mistake buying fish so small when you consider your experience level.