Hi There, my DS was diagnosed with Right side Hemiplegic cerebral palsy from about 6 months. It is quite upsetting and frightening when you find this out, but take heart my little boy is doing brilliantly! He is a little star! took him about three years to start standing, and then shortly walking obviously not brilliantly, but independently. I think he walks brilliantly now though! Also talking can start later, as their bodies have to work much harder to reach their milestones. My DS didn't start taking until after he walked, but you can't shut him up now :o
There Is a website devoted to Hemiplegia which is \link{http://www.hemihelp.co.uk\www.hemihelp.org}
Basically hemiplegia is a weakness or stiffness down one side of the body, there are other problems also with hemiplegia, but the most noticable is the difficulties using the one side of the body, it can be either left or right side depending on the damage to the brain (I believe).
My advice would be to take each day as it comes, sometimes you get frightening information which worries the hell out of you, but sometimes these things do not come to pass. Joining hemihelp helps because the older children talk about their experiences which does help you. Also it has lots of advice and information.
My DS is in mainstream school, he is behind the other children, but he currently has about 3 girlfriends and lots of mates. He has problems walking for long distances and has a wheelchair for this, he falls over quite a bit (as balance is a problem with hemiplegia) and doesn't use his right arm much. But he uses his left arm excellently and manages to do things one handed. There are some Hemiplegic people that are gold medalists in the special olympics, one is a swimmer and another I know about is a show jumper.
I would also advise you to get tough and push quite a bit for things that you might need, sometimes questions need to be asked but unfortunately being new to disabilities you don't know what questions you need to ask and no-one volunteers information, not even the occupational therapists who are there to help you. Just keep asking even if you feel it's a daft question.
And finally and I know I don't have to say this just cherish them for being them and treat as you would a child without special needs.
My best wishes to you.