How long was your 5 1/2 gallon tank setup? Did you transfer gravel, decorations and filter from the 5 1/2g to the new tank? If so, that will greatly reduce your cycle.
Get a basic test kit for ammonia, nitrites and nitratea. Since you have fish in there, anything you measuer .25 or higher ammonia, do a 15-20% water change.
Read the cycling articles and that will give you more details.