I would like to start using ConText to create a scientific presentation
poster to be printed in A0 or smaller size
A single sheet of pubblication in which text and figures with captions,
can be framed (i.e. boxed) and putted on the page in row and colum, 
equally distibuted or not.
A loose layout wish can be the attaced one.

Any hint on where to find an howto guide, a template or a beginner
document to start from?

How ConText is suited for this purpose and popular for this goal?

Regards.