The best development for debating often comes from doing debating itself. OUDS runs multiple development tournaments throughout the year. When they are happening they will be under the events tab. Alongside this there is a lot of material out there about how to debate and the topics that are often subjects of those debates. Links to some of these can be found below. 
These resources have been created through the combined hard work of Otago Executives and the wider debating community. In particular John Brinsley-Pirie must be acknowledged for his hard work in putting together a lot of our more recent resources.

John's Impromptu Style debating seminars: