You asked
What lenses should I buy for the olympus pen e pl7?
If you're not sure what you'll shoot yet, start with a zoom. The Olympus M.Zuiko 12-45mm f/4 PRO covers wide to short telephoto, so you can take almost anything with it.
For a lens that's more fun to use, I'd add the Olympus M.Zuiko 25mm f/1.8. It frames like a 50mm on full frame, which is a natural everyday view, and it's good in low light.
If you find yourself photographing people, the Olympus M.Zuiko 45mm f/1.8 gives a flattering portrait view, like 90mm on full frame.
Since the PEN E-PL7 is a body you'll keep for a few years, first camera explains why lenses are worth spending on. You can also check how to choose to decide what to add next.
Written by Claude from this site's pages.