You can always begin making a hello world activity. but to deeply understand the code you must understand sugar's api for that you can follow this resources.
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*There is a Sugar Almanac page on OLPC Wiki [http://wiki.laptop.org/go/Sugar_Almanac Sugar's Almanac]
*There is a Sugar Almanac page on OLPC Wiki [http://wiki.laptop.org/go/Sugar_Almanac Sugar's Almanac]
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*Also de API is documented.
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*Also de [http://api.sugarlabs.org/ API] is documented following this procedure ''[[DocumentationTeam/API_Documentation | API Documentation]]''