Clicking on Help - Inkscape Manual shall lead to the main reference of this designer grade drawing tool. Although the icons are well placed and obvious with its function, but memorizing the shortcut keys for commonly used tools or operations is really the key to fast graphic editing. The shortcut key listing is available at http://inkscape.org/doc/keys046.html, which is also accessible via menu of Help - Keys and Mouse Reference.

Many good SVG examples and librabries can be obtained from http://openclipart.org. There are already too many good documentations online for inkscape. One commonly needed graphic object is a button which can be found in this step by step online tutorial http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Button.html.