A.H.
My son was 16.5 months old when I brought my daughter home. I basically put him to work doing little things for me like getting a diaper, carrying the diaper baggie to the trash, helping put away toys, etc. He loved it because I think it made him feel like he was my partner and helped diffuse any "new baby jealousy". I am a former teacher so I actually went out and purchase a lesson plan book and started planning our day, hour by hour, the way I would have for my class. In the morning we would make beds, do a load of laundry (my son loves to put pillows on the bed, put dirty clothes in the hamper and put the clean, wet clothes in the dryer, etc.) We would have breakfast and then go for a walk and play in our backyard for awhile. My daughter would mostly sleep during all of this time. We would listen to music or do an art activity and have some play time indoors, have a play date or go to an activity outside of our home-like Gymboree or PE 101. By then it was time for lunch. I moved my son's bath time to right after lunch because it was relaxing for him. He would have a bottle of milk after this while I fed my daughter and then they would both sleep from 1-3pm or so. It really helped make our day run smoothly and my son transitioned from being an only child to being a big brother really well. Now both of my kids are great playmates (they occasionally have a fight, but it is rare) and they do help me keep our house in order as well. Hope this helps and congrats on your new baby!
A.