lucysnowe:
My friends and I actually found it was harder on us than our DCs. Basically this is when your little baby becomes a proper child.
I agree with many posts (especially dixiechick1975 and fairypenguin) - and strongly agree that those first months in YR are really about settling into the social situation and school environment.
You can also look on the MN Education page (just click education on the blue menu line and have a look at various topics - starting school may be useful).
In terms of what you can do:
Before starting school:
Once you know where you are going talk about that school - talk about what you liked about school.
Possibly walk past it and show your DD where they will be going
If there is a summer fair and it is open to wider community - go along - so she can see the school.
Once you get the acceptance letter (usually late March) from the school - they usually have a series of visits (some just parents, some just child) in June/ July time. This is to start that process of getting to know the school for your DD and for the teachers gives them a chance to meet your DD and become a bit more familiar with her as an individual.
First Term
Allow your DD the entire first term to settle in. It can be a real shock starting school. Sometimes for the DC and sometimes from the Mum and Dad.
If you can in that first term - try to attend meetings, information sessions, reading mornings, etc... to get a feel for what they are doing and for the school. It also shows that you care and are interested in your DDs learning (to DD and school).
It's a very useful time to build reading routines. If you haven't already established one. We started reading books after bath in nursery but carried on with school.
Our experience was that YR/ Y1 really focus on reading skills and maths took a back seat. This may not be other schools - but if you are worried about maths skills - play counting games, card games, buy workbooks for YR level and try and encourage as much counting (up/ down, by 2, etc...) as you can over those first years.
Finally bear in mind that elsewhere in the world a 4/5 year old would still be in nursery. So try to relax about 'academic' work this year. It really is about learning through play.