Technical support is not available for ArcSketch; however, you can find many useful resources on the Support page, including the User Guide, Technical FAQs, and a discussion forum.
All three basic kinds of geometry (points, lines, and polygons) can be sketched. They will be represented by your choice of marker, line, and area symbols. Raster sketching is not supported at this time.
ArcSketch allows you to sketch features quickly, easily, and intuitively, without having to plan ahead or deal with much ArcGIS overhead. Afterward, the sketched features can be converted into standard features and shared with others.
ArcSketch allows you to create and edit sketches without having to specify the layer each time. You can generate symbols that specify the creation of feature classes and attributes with defined structure.