I have 4 Amaryllis flowers growing this year. The bulb sends out a long shoot after it starts to grow leaves. This flower spike will grow rapidly as long as it gets plenty of water. There can usually be 1 to 4 flower buds. All my Amaryllis plants have deep red flowers but they do come in other colours.
We got another plant in a deep glass vase which was in flower. Now the flower stem has gone over (died back) but its putting out leaves. I have two more plants that I have kept for years. One still has a long leaf on it from last year. Both are responding to being watered by starting to come into leaf again.
A tip, Amaryllis go dormant for a while from autumn. You need to start watering again mid winter to get them to start to grow. If you need to repot them only go up one size. They like to be quite tight in their pots. Use a good house compost, maybe a bit sandy to stop them getting waterlogged. Then sit back and enjoy the amazing flowers.