Personally i started by reading "The Crippled Tree" which is the first in her autobiographical/chinese history series. But for someone else it depends on what you want. So if you're looking for historical overview and her own personal story (which is really interesting) id say start there.

However she also has two biographies on Mao Zedong [one covering 1890s to 1949, and the other covering 1949-76] and a biography on Zhou Enlai. So if you're more interested in them than anything else I definitely reccomend them.

She also wrote a lot of romance books. I haven't read them [yet] so I'd say probably start with "A Many Splendored Thing" since thats her most well known one. But she also has a sapphic book [which shocked the hell out of me] called "winter love."

So if you just want to get into reading her books in general, then id start with her autobiographical series, since it has a little of everything (theres this really beautiful bit where she describes how her parents fell in love. I wont spoil anything but really like it). But there's enough that you can pick and choose. [She also has at least two smaller books on the Malayan Emergency and Tibet, titled "The Rain in my Drink" and "Lhasa the Open City" respectively].