A.H.
Kishia, First let me congratulate you on your news. It is a wonderful privelege to be a mother. My fraternal twins (boy/girl) are now 16. They were numbers 4 and 5 out of 6. The oldest child at the time had just turned 6 years old. It was a bit chaotic at our house for a few years, but looking back I treasure those memories. Luckily I had the good sense to video tape a lot of what the kids did and how they played, because honestly those years were a blurr if going from pure memory.
So the advice that I would like to give you would be to prepare yourself and your house for the year to come. The most important thing that I can tell you is that it won't be perfect. Things will not get "done", but that's ok.
I remember freezing lots of food and storing it in small containers so that my oldest daughters could reach it and pop it in the microwave if needed. My mom came over and helped me make a bunch of biscuit and sausage and ham sandwhiches and freeze them in little bags with 2 or 4 in each bag. That gave the kids something quick to eat that wasn't always cereal. I just got it out the night before and let it thaw in the frig. It was also good for the adults as well. Spaghetti, veggie soup, and chicken strips freeze well also. I taught my 6 and 5 year olds of how to do simple things like setting the table, folding towels, and washing dishes. I put as many of the dishes and easy to make foods within reach of the kids (in the floor level shelves) so they didn't have to climb up to get them. Of course I had paper goods on hand for those days that it seemd nothing was getting done. But I did try to limit the use of disposables as much as possible.
As far as your 6 year old ... involving the older sibling in the care of the child is a wonderful thing as long as you don't overdo it. Have some talks with your child about what he/she can do to help. Let him practice putting on a diaper, carrying the baby, rubbing mommy's shoulders.... You can also come up with some "I'm bored" type of things to do while you are busy with the babies and he will be left on his own for entertainment. We sat down and wrote it all out on a big poster board and the kids colored and decorated it. We then displayed it in our living room which is where we always seemed to be. When the kids would come to me with requests or whining I often directed them to the "I'm bored board". It really worked well. We went shopping together for supplies and got the areas set up so that the kids could handle it themselves for those times when I was just too frazzled or too busy to play with them. ( we had a tape recorder and books on tape, pretty paper and funny scissors, markers, crayons, coloring books, my husband made them a babie doll house.... you get the picture.) The point was I wanted them to feel like I hadn't forgotten about them even if I couldn't always be focused on them.
My children are very independent, well mannered and mature kids. they love each other and spend a lot of time together. They share many of the same friends and interests. I know I ddidn't do everything right, but those hectic years and "hard times" were worth it. I promise.
Good luck and God Bless you and your family.