This article is from the Children's Books FAQ, by Hilary Morrison, email@example.com with numerous contributions by others.
At this age, kids like the sound of your voice, as well as books
they can play with, like lift-the-flap books. The most important
thing, I think, is that *you* should enjoy the books, because the
child can certainly pick that up from your tone.
As for frequency, I would try and read one or more stories a
couple of times a day - perhaps when you get home after work, and
just before bed, or just before or after dinner. Have a specific
place for reading that is relatively quiet, and leave a pile of
books there. Our kids still demand that the same book be read
over and over again, so you don't have to worry about variety.
You might also see if the local library has a children's room, and
go there together once a week.
Certainly kids vary in their tolerance for sitting still, but it
improves with time and practice.