Plug-ins

Link
You better do a google search for Photoshop plug-ins – there are many resources online:
1, 2, 3 ,4 how to install plug-ins …

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Human Interface Guidelines – Design Resources (Apple, Google)

Link

Google Phone (Android) – Design Principles

  •  Iconography –  Design an icon at anysize in Illustartor then change the artboard to the correct size, and scale the icon for the size. Save as PNG is good or SVG is ok.

Apple Phone (iPhones, iO) – Designing for iOS 7

Examples:
Icon Design Tutorial: Drawing A Pencil Icon
More Tutorials
Ideas

Icon-sizes

by Irene Belik