Courchevel is quite an large ski area, it has a variety of ski runs for all different abilities. There are plenty of options for wizz kid boarders and skiers, right down to the novice. The ski lifts etc are very good.
The ski schools are very good, and have really experienced instructors, and cater for young children from around 4 or 5 years of age, my kids had a really good experience, the instructor was very patient and skilled at her job, right up to those of advanced years, as long as you can stand up!
It is generally very friendly, and good for families.
It is however, quite an expensive resort/area. If you are on a bit of a budget, venture down the mountain to some of the villages, there are large supermarkets which are better value for money.
On the whole, an enjoyable experience.