Hi Raindance
Course content will vary a bit between individual programmes, but I imagine a Masters in education would include some combination of formal training (in classes or workshops) with practical training and placements.
The exact balance will probably depend on whether the programme is a professional qualification (allowing you to work as a teacher in the US education system) or a more academic programme, focussing on pedagogical theory and practice.
There's a general guide to studying a Masters in the USA over at FindAMasters.com:
Another good source of advice is the Fulbright commission - they help international postgraduates looking to study in the US:
Perhaps others will be able to give you more specific advice on American education programmes.
Hope that helps and best of luck!
Mark