Well your nitrates are high because you added fish too soon to your tank. Your fish are probably unhealthy (and have ick) because you didn't properly introduce the fish (cycle first and QT).
My suggestion would be...
Buy liquid test kits, right now you need to be measuring Ammonia, Nitrite, and Nitrates. Test all and post back results. In order to lower nitrates you need to do water changes (i think the source is the amount of fish you've introduced in a short period of time), probably 15% every day or so until your nitrates are around 15.
For your sick fish, you should probably get another small tank, buy some ick medication, use the salt water from your old tank (and when doing changes do small changes in this small medicated tank too) and put it in the small tank. Medicate those fish if you are sure they have ick.
That is a start for you. YOu can either do this (or something similar, you need to reduce those nitrates and you need to medicate those fish), or take everything back and start correctly.