My daughter was also two when my son was born. We thought she would be so jealous and we were really worried but she took it really well. She came to the hospital once to visit. We made sure that the baby was in the bassinet when they came in rather than me holding him. I said Hi to her first and sat with her for a few minutes and hugged her (it had been almost two days since she had seen me) and then I asked her if she wanted to see her brother. I told her I would pick him up so she could see him better and she was really excited. It seemed to go well but we kept the visit short because soon she was pushing buttons and getting into things.
My husband brought her when they came to take us home. He let her help pack a bag of things for the baby before they came to pick us up - she picked out a blanket, a stuffed animal, and some other things. She was really excited to show us the stuff she brought. It was a little crazy though when we first got home. I was nervous because she was excited and jumping around everywhere while we were trying to unpack and everything. I think it would have been better (at least for me) if I had been able to get situated first before hand.
Also, a tip someone else gave us that I think helps, when you are referring to the baby, as much as possible, say "your sister" rather than just "the baby." That way, when they are upset that you can't do what they want because the baby is hungry and needs to eat, it’s supposed to make them feel more like you are talking care of something that is theirs - their sister. It sounds strange, but I think it really does help, especially with toddlers.
When people came to visit, we asked them to ask my daughter first if they could see or hold "her baby brother." I think that made her feel important and that she was lucky to have him. She also had a doll and whenever I would change a diaper or feed him, I would ask her if she wanted to change her baby's diaper. I think it helped make her feel included in what we were doing and I always tried to find something to keep her busy when I was busy with the baby. It might be a little trickier with boys though - maybe they could have a teddy bear with a diaper? Also, whenever I would put him down to sleep, I would always ask her which stuffed animal her brother would want to look at and she always found a different animal and we would put it outside his crib for him to look at. Even now that he is 18 months old, she is still always telling me what he needs.
I think the main thing is just to try to include them as much as possible and let them make decisions for the baby whenever you can so that they will feel like important big brothers.
It sounds like you're going to have your hands full but it is so much fun to see the "big" kids helping the new little one. Good luck and best wishes!