D.T.
In Mercer Mayer's book entitled The New Baby, Little Critter learns that a new baby is nice, but also not an instant playmate. It's a very realistic depiction of what your toddler can expect.
My most practical advice: According to my experience, your toddler will be too young to be expected to act lovingly toward the baby at all times. Don't leave them alone together. I once walked in on my first child (2 y/o) whacking her new baby sister on the head with a hairbrush. Ouch!
What I found to be very helpful to curb resentment was to refer to the new baby as "your baby" when speaking to the toddler. This will hopefully communicate to the "big sister" what her very special, new role in the family will be.
Lastly, reassure yourself that new babies really don't demand the same kind of attention that your toddler does. It's a pretty gradual transition most of the time.
D.