Mathematica comes with some built-in slide show templates. If you select File / New / Slide Show, the choices pop up. How can I make my own template?
closed as too broad by MarcoB, m_goldberg, Oleksandr R., dr.blochwave, ilian Sep 21 '15 at 14:34
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This should get you started.
Start by opening a new slide show notebook by picking a template from File > New > Slide Show ...
Open the Style a nd Format Notebooks How-to page in the Documentation Center.
Note that as well as creating a new style in a stylesheet you can also edit the already defined styles.