Before your twins are born you will need to work out where you are planning on feeding your twins both in the day time and at night, and set up a comfortable area to do this both upstairs and downstairs.
You will also need to buy something for them to sleep in such as cots / Moses baskets for night time and bouncy chairs for daytime naps. It is also a good idea to decide whether you would prefer to breastfeed or bottle feed, as the equipment you need differs slightly between the two options.
How you arrange your home largely depends on what space you have available to you and how you currently use it. If you have space in your bedroom, that would be an ideal place to put your twins cot(s) for the first 6 months.
Not everybody has the space to do this unfortunately, so you might have to put them in a spare bedroom. Or you might decide you are going to give them a room each right from the start. If you have a little used room downstairs you could turn it into a daytime nap room / playroom. There are lots of possible options and it really is entirely up to you to figure out how to make your home work to its highest potential.
Do twins simply HAVE to share a cot/ crib? This is a matter of personal preference. Some twins seem to sleep better together, however others are perfectly content in their own cots/cribs. If you have space for them to have one each and your budget allows you to, buy a cot /crib each. At the end of the day you have to do whatever is right for you and your family. There is no one set one-rule-fits-all policy. From a purely personal point of view I put my twins in separate cots right from the start, and didn’t bother at all with Moses Baskets. I have never had any problems with them settling. You could potentially put both twins into the same cot at first, leaving one cot downstairs for daytime naps and the other cot upstairs in your room or the nursery. If you do let them share a cot/crib make sure you follow current sleeping safety guidelines, making sure that each child has their feet to the cot bars so they can’t shuffle under the covers and over heat/ suffocate.