My DD started nursery a couple of months ago. She's just turned 1. 2 full days a week.
To start with there will be tears (from both of you) which is totally normal but it will definitely get better as time goes on and you will start to see the upside before long.
While you're going through the difficult first bit, don't expect too much from either of you - when you leave your DC for the first time, go down the road and eat a cake and read a trashy magazine, don't expect to be able to concentrate on anything more taxing. In the same vein, don't expect your DC to be thrilled about the whole business, they need to learn their own strategies and schemes to negotiate this new world and that all takes time, but will happen.
My DD is pretty clingy and wasn't happy to be left to start with, but after the first week (during which she sucked her toy sheep all day), she actually started to enjoy herself and 2 months on she marches up to her friends to give them a kiss when she gets in. She still moans sometimes when we get to nursery, but then we would all rather stay at home in bed sometimes.
One of the downsides (especially at this time of year) is that they get every cold and bug going. The massive upside however, is that in the last few months my DD has got really really sociable, much more confident with strangers, is walking around the place and talking to anyone who'll listen. Everything she was starting to do has accelerated hugely. She also does the actions to 'Twinkle Twinkle' at any opportunity which I find massively endearing and not something I've taught her.
Good luck, it will be ok.