Bon voyage!
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Brush up on your French.
Cast members will have tags on their name tags, showing which languages they speak, but most will speak English. Signs are in French and English, and there are English maps available. However, the narration on some rides is in French, which might be hard to follow.
Remember that you'll be a bit outside of Paris.
Disneyland Paris is about 60mins from Gare du Nord by train. If you take the Eurostar, there is a direct route straight to the theme park. There are various shuttle services from Paris too. Depending on which airport you fly into, there are only a few buses which go to the park. Check before you book, to save waiting time.
As to whether to stay at a Disney hotel, there are pros and cons, but the extra magic hours (where hotel guests can enter the park early) are an obvious draw.
Get out the measuring tape.
Make sure you know exactly how tall your child is, and what the height requirements are for a ride before you start queuing.