Hi, congratulations 
Mine were 6 weeks early.
Can't remember exact dates but..
First few weeks were in hospital, next few weeks were cuddling and feeding. Then we moved on to bouncy chairs when they started focussing, so they could look at stuff hanging down, or on a play mat on floor looking at hanging things, but really only 5 or 10 mins at a time, we built up slowly.
At this time they were taking naps in a moses baskes in living room.
At maybe four or so months old we started taking the moses basket up stairs in evening, probably about 8 or 9pm, to try to teach them difference between day and night, and we could start having baby free evenings. My husband worked hard to settle them upstairs, if my milky boobs walked into the room they would scream! We used a lullaby cd, muslin to snuggle (they seemed to like this) and dummy upstairs to give them some sleep associations.
We found the difficult thing with prem babies is the newborn stage does seem to last forever, when they could focus and have time on the play mat or bouncy chair things got easier, then when they could be propped up on cushions to watch the world go by I had free hands - woo hoo!
Life has been much easier for us from about 8 months, they are 1 on the 31st and absolutely gorgeous and brilliant.
First few months definitely lots of cuddling, go easy on yourself and don't feel like you have to do lots of stimulation or anything. Just mummy, maybe a song or two, and gaze into eachothers eyes is all they need!
One of mine is now trying to 'help' me type so I'm going!