Congratulations and good luck for the impending delivery !
My DSs 1 and 2 were 12 months (and the all important 10 days ) apart, and I found a sling or some kind of baby-wearing thingimajig invaluable. I very much felt that I had 2 babies, a big one and a (in my case very) little one (DS2 was born at 31 weeks). DS1 still wanted to be carried a lot and having hands free was really important at times. I felt lucky that DS1 was walking by the time DS2 came out of hospital; it made for instance getting all of us out of the car much easier.
You will muddle through, you will! I did at times wonder whether twins would have been easier or harder to look after ... They are now aged 5 and 6 great playmates to each other andonlytrytokilleachotherveryrarely.
Sorry, I'll stop waffling, in conclusion my advice would be to get a ring sling for tiny baby and ERGO baby carrier for later.