Hi. Sorry to hear about the diagnosis, but don't panic! My sister and partner both have it and catering is relly easy these days.
All supermarkets have free from sections and if you join coeliac uk you can get an app for your phone which scans the barcodes on items and tells you the ingredients and whether they are safe or not. Cool!
Coeliac UK also send magazines and a yearly book of products.
Some GP services allow you to order food on prescription, but not all do. As there is so much gluten free stuff available in shops, it's not so crucial these days.
For the early stages of diagnosis it's really important to not cross-contaminate, as Snowdrops has said. Over time, as the villi improve their life in the gut, accidental contamination will not have such a big affect, but best to keep clean and separate food stuffs.
I never have real flour or pasta in the house and can't tell the difference with the latter now! There are loads of GF products in the general supermarket aisles, so it pays to hunt around.
Happy shopping! Make an adventure of it and let the kids find the food. All gluten containing ingredients must, by law, be highlighted on the back of the packet!
Good luck and hope your little one feels better soon.
Chrysalis