She is a destructive, chaotic goddess and she is usually worshiped by people who fear her and hope she won't kill them if they give her offerings. These people are usually sailors and people travelling somewhere by sea. She controls all the harsh power of the sea and has a fondness for drowning people if the mood takes her.
Her big rival is Selune, goddess of light, the moon, star and navigation. The two continually contest against each other over the fate of ships at sea, Selune trying to help them navigate and Umberlee trying to sink them.
Those who truly worship Umberlee tend to be chaotic evil magic users and clerics since she is a chaotic evil lesser goddess. Her church is disorganised due to her chaotic nature and her shrines and temples are spread in random, disparate locations. If you are a member of her church you want to be the strongest because disputes settled under her authority do not go with justice, but to the strongest.
I've always found the rich tapestry of D&D fascinating, although I've only ever live action roleplayed - could never quite get in to the table top version. I have lots of Forgotten Realms books and they are always a great read.
Sources: Wikipedia | Forgotten Realms Wiki | Revolvy
Have you read any Forgotten Realms? Are you a roleplayer? Have any of your characters ever worshiped Umberlee?
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