Congratulations,
I've got 2 yo twins and a 5 yo DS. It is tiring but great (did I really type that?)
My advice would be to get them into a routine asap, I was on 3 hour feed cycles (I FF, BF for a couple of days but DS2 found it difficult and I couldn't move when feeding). I got a lot of help from family, MIL stayed for 2 /3 nights a week at first and helped with feeds. DH at weekends and I did the rest. DH had to sleep in the week for work. So many people advised that we split them and took one each, I don't see how that works if DH has to work. If one woke in the night, I woke the other and fed them both at the same time. I kept them synochronised during the days, feeds, naps etc.
A swing is great for soothing one if both are crying. Lifesaver in the early weeks / months./
I had a CS, but DS1 was a CS too and one twin was a breech.
Financially its a hit, I haven't gone back to work as 2 X nursery fees at the same age just didn't make sense. I've found that difficult, and still find it difficult.
DS1 is great with them, amazing, occassionally gets cross but they are great at destroying things. It is hard work looking after twins and making sure that he gets time with us as well.
I don't bath the twins at night, in the morning once everyone else is out at work or school. It means a less frantic evening plus DS1 gets more time with both of us.
I look at them now and still cannot quite believe I have twins, they make me laugh bumbling around together like little Tomliboos. Its a bumpy ride but fun.