Personally, I wouldn't start with Wizard of Earthsea, that book was published in 1968 and definitely has the prose and flow modern readers are not as used to, especially for the fantasy genre.
I read Left Hand of Darkness for school, but it was The Dispossessed plus her non-fiction essays that got me into her. Omelas is also a good short story starting point, and I think it's only 20 pages.
The Ones Who ~~Left for~~ Walk Away From Omelas. A 19-20 page short story about what a "utopia" truly is. (Yes, yes, "we live in an society")
Her non-fiction essays on writing, and reflecting on her body of work are also very good. She was an incredibly forward thinking writer, and one of my favourite authors of all time.