Good start. I would make sure your cuc has enough to eat and assume you haven't started "ugly" stages yet. In terms of stocking I think above advice for developing a plan is what you want to do. When I had a Biocube I found the light to be sufficient for softies and lps and so I set it up as a mixed reef which is what most of us end up doing. I would start with some of the easier to keep softies and peaceful lps corals (mushrooms, acans, blastomussa, duncans, candy canes, etc.) and choose a few fish that are colorful, swim in different parts of water column, have interesting/unusual behavior, perform a function perhaps (algae control) and won't outgrow your tank. Some safe bets for first fish are clowns, orchid dottybacks, royal grammas, neon and clown gobies, and blennies. This is a great blog to ask about compatibility of fish and corals.
Patience is key and what you do now will set the course of your tank's health in months and years to come.