Well, I can tell you what we did and how it's going. DS1 is 21 months, DS2 now nearly 3 weeks. DS1 is a very active, smiley, lad that's quite good at sharing and quite independent - never been very clingy.
I had a planned c section and we decided that DS1 wouldn't visit in hospital as he'd just run round like a loon and everyone would be stressed. I was only in for 24 hours so it didn't really make much difference to be honest.
DH picked me up and we got home around tea time. Brought DS2 in, in the car seat and mentioned to DS1 that he was his little brother. DS1 carried on with his tea while DS2 was briefly passed round grandparents who'd been looking after DS1. DS1 then went to bed - seemed mildly interested in DS2 without being particularly bothered one way or the other.
Since then, DH has been doing most of the lifting / running round after DS1 due to me having a section, while I've been looking after DS2. Having said that, DS2 is quite a good sleeper so plenty of time to play with DS1 and I've just about mastered reading a book with DS1 while breastfeeding DS2!
We're not forcing any interaction between the boys, we explain to DS1 what we're doing when we're feeding or changing DS2. DS1 shows passing interest in DS2 - tucks him in when he's dozing in the crib downstairs, checks on him when he's sleeping occasionally, tries to rock the crib (which doesn't actually rock!), passes us the nappy rash spray when we're changing him, waves bit of lego in his direction etc. He has declined to give him a kiss so far (but then, we're rarely bestowed such affection either
) and seems totally content with the addition to the household. We thank him / praise him when he helps with DS2 etc.
It hasn't really impacted him to be honest and we're quite happy with how things are going - he did get a present from DS2 as well, but at 21 months I'm really not sure that made a difference! Might all change but so far letting them adapt to each other at their own pace seems to be going well.
Good luck - I'm sure you'll be fine.