Just read Pickman's Model and The Thing on the Doorstep. My Lovecraft reading list so far:
The Dunwich Horror
Call of Cthulhu
Herbert West- Reanimator
The Colour Out of Space
The Beast in the Cave
The Thing on the Doorstep
I need to finish reading The Shadow Over Innsmouth and I need to read The Haunter of the Dark. Thankfully, most are short stories and the longer ones are novellas, so I can read through them in about a day or two. I can also find them all online, which makes things easier.
The Dunwich Horror was great and still remains my favorite. I definitely recommend starting with that one, as Lovecraft wrote it as more of a serial and it has a more pulpy prose. Herbert West- Reanimator was also a good one, and it absolutely nothing like the schlock of the movie. I enjoyed Pickman's Model, and it was quite... weird.