Hi R.
I'm a mom of 2 year old twins and I wish I started their sleep schedule earlier, so I would suggest starting now! The sooner they're sleeping at the same time (more or less) the more sanity you'll have. Also, it really is good for children to have scheduled sleep time, it seems in my non-scientific data, that they sleep better. Lastly, it will help them to get used to tuning out each others' cries. My kids can sleep through the other's crying beginning to mid nap - amazes me!
My little girl really seemed to need swaddling or she would thrash her arms and legs about and not sleep. So we swaddled her in some way until she was 3 months old. My son could pass out any time, so he was in sleep sacks earlier.
Hope this helps, if you have any other twin questions, feel free to throw them past me. I'm not an expert per se, but have had lots of questions, frustrations, solutions and experience!
Best, H.
p.s. by the way, it really does get easier the older they get!