Congratulations !! I felt just like you and wondered how I would ever manage, but honestly your organisation skills are just about to come into their own. Plan everything carefully in advance:
All clothes, nappy bag packed, breakfast bowls out and everything prepared, washing on, buggy ready the night before, every night without fail. It saves the morning rush and forgetting things at the last minute.
Prepare dinner at nap time in the afternoon ~ invest in a slow cooker, chop all the veggies etc, and then go and sit down and relax. The worst part of any day is the twilight zone 5-7pm so be sure to get the dinner done in the afternoon and it really takes the stress out of it. Keep the feeling happy with games and singing will help, and a sling I found super helpful, but a baby chair facing you will work just as well for your newborn whilst you feed and take care of your toddler.
Bring dinner forward and start bath time early and make it leisurely, with music (make sure you have a radio upstairs for singing and keeping the mood uplifting) and make it really fun for both. I had a baby chair with harness upstairs and downstairs so I always had somewhere safe to put the baby when my toddler needed me. My eldest dd and I would bath the baby together, she loved doing and would also massage the baby and put her nappy on. Get your toddler involved in everything ~ it is a sure way to keep them happy and connected.
Keep your plans simple for day time activities, do not over commit, it leads to frantic days. One thing a day ~ feed the ducks, a picnic, a visit to the park. Simple and relaxing. Everything needs to be done slowly, the minute you decide not to pressure yourself into taking on too much, you will then enjoy your days out so much more, you have many many wonderful days to look forward to.
Lastly book an hour or two out for yourself every week, dh or someone close to give you a break. This way you will never feel depleted and will have some down time so you can continue being a truly wonderful parent, some weeks you will need it more than others, but you should always try to have a bit of me time.
Enjoy every moment. I was really scared, but really needn't have worried, honestly the 0-1 is the very hardest, this time you will know just what to do!! Nothing will faze you, and you are likely to be a far more confident parent because of it x