Twin mum here. First and foremost this is certainly going to be brutally hard work, considering the shock, age of your daughter and practicality of having unexpected twins.
I think ur absolutely amazing for standing by her and accepting her decision and being prepared to help out, everything happens for a reason. Your husband will come round but I can see why he's angry and upset.
I think the no1 thing to have is a travel system pram, such as the bugaboo, if u can buy a second hand one of these with all the parts - grab it! Second hand with everything else (bar the carseat, this will also need to be compatible with the bugaboo or whichever u buy)
Get into the sales for bottles etc, ur definatly better getting more bottles than u think as well to have spare for times when u haven't had the time to clean etc.
Everyone went on at me about "routine" with my two... I did take this on board but it's very important to remember that what one baby needs might not necessarily mean the other needs the same, they are two individual babies after all. Luckily mine seemed to work in sync thank The Lord! But this might not be the case and u may need to be persistent and have lots of patience with managing this.
During the hard days after my babies feeds I found it a lot easier to put them both in the car and go for a "nap time" drive to ensure they both slept and settled, I think this helped with them being in sync. This is only ok if u feel you've had enough sleep yourself tho, as ideally u want to be sleeping when they're asleep.
Nuby RapidCool Portable Baby Bottle Maker - a God send.
A sling - for one baby whilst holding the other.
The bottom line of it is your all just going to need to be as prepared as u can be and find a way to work it out once the babies are here. It may occur to ur daughter after they're born that she can't continue with education for now, she may need to rely on benefits u til such times the babies are older and she can start again.
Where there's a will there's a way and I truly wish u all the best xx