I copied this from elsewhere on the net.

If you're going to plant it outdoors, wait until all threats of frost are gone. Otherwise, you can give it a jump-start indoors by starting it in a pot. You need a large pot at least 18 inches across and deep. Add a good potting soil and some soil polymers, which help retain water and keep the bulb hydrated. Elephant ears are heavy feeders, so add a handful of an all-purpose 10-10-10 fertilizer and mix it into the soil before planting the bulb. Plant the bulb, with the point up, to a depth two times the height of the bulb.

Give the bulb a good drink of water and then don't water at all until you see sprouts. Then keep the soil relatively moist. Remember, it's a tropical and a heavy feeder. So once it starts sprouting, feed it every couple of weeks with a water-soluble fertilizer that is diluted to half strength. In no time, this pot will grow big ears.

Additionally it said to plant it twice as deep as its diameter.

Sounds like you did good...just be careful of cold nights if left outside.

Sue

Are you asking which way is "upward" for an EE? because that's often a problem identifying.

The bulb usually has long fibrous 'hairs' in one direction... these are not the roots, but are remnants of the leaves of the plant. The direction of the 'hairs' is upward (i.e., the top of the bulb).

I've found that if the bulb is large and healthy, and given good/warm potting conditions, it can be expected to show sprouts within two or three weeks.