User blog comment:VegasFox/Good Spriters?/@comment-3190872-20120102224902

http://www.themysticalforestzone.com/Sprite_section.htm

This site has all your Sonic spriting needs, including a few good bases. As for tips, try to look onto other sprites, and get a feel of what looks proper. Then just try to visualize how your character would look, and go at it. Keep trying until you get something that looks good. Practice makes perfect, and all that jazz.