I've been growing Amaryllis' for many years now and have learned a few things about growing them.  First I start with finding a nice pot that is a bit larger than the bulb to allow for the growth of the roots.  I usually use a pot that allows about 1" wide space around the bulb.   (Only use a pot with a drainage hole on the bottom)  Use some kind of material to cover the drainage hole inside of the pot prior to filling - paper towel, screening, coffee filter, etc.  Do not use garden soil.  Plant the Amaryllis bulb in the pot using potting soil with about 1/3 to 1/2 of the bulb above the potting soil.   I'll then sprinkle Mosquito Bits on the surface of the soil to stop any soil gnats from emerging.   I'll then cover the soil with some type of cover - mulch, moss, etc.  I've found that using a green dyed Spanish moss works quite well and has a good look to it.  After planting, water thoroughly until water runs out of the bottom hole in the pot.  Keep in a bright cool area in your house to keep the stem short.  Keep soil moist but not wet. Let the water run out of the pot in the sink before putting back on the dish.  It should bloom in a number of weeks.  When it is about to bloom place it in a favorite spot.  You might need to stake up the flower if it gets too tall.  Be aware that you may get  a second flowering stem and sometimes a third one will grow.  After flowering let the flower stem dry out so that the bulb reabsorbs the nutrients from the stem. When the stem is dry just cut it at the base just above the bulb.  Then allow the leaves to grow all spring and summer in the sun.  It’s best to start it in partial sun then move it into full sun to acclimatize and avoid sun burn on the leaves.   When the temperature gets to be steadily in the 70’s place it outside to get the best light and remember to water.  It's a good idea to fertilize it during this time.  When October comes around (maybe earlier in colder climates), and prior to any frost, bring the pot indoors, stop watering, and place in a dark area in the basement and allow the leaves to dry out.  After a couple of weeks place it on its side and rotate it every couple of weeks so that it does not gather any moisture on the bulb or surrounding soil that may rot the bulb.  When all of the leaves turn yellow/brown and dry out cut them off at the bulb about 1.5” above the bulb.  In early/mid December you may then repot it in new potting mix and start to water again.  It should bloom again for years to come if these steps are followed.