Tutorials are one of the best ways to learn how to do something. Being able to follow along and do as you watch how it should be done, and given the time and ability to make changes and experiment on how they work is an excellent way to grasp the basics of what you want to know how to do. Here are some for you.
How to DollHow to Doll currently contains my way to doll hair and shirt/dresses. Doll Site Design Tips highlights a few of my pet peeves in websites, and suggests things you should do instead. Doll optimization tips highlights some ways I use to maintain my dolls and keep them to reasonable filesizes and quality. Color Theory examines way to make tools like Color Balance work for you.
Various palettes, props, and miscellanious pixel goods
The Importance of Diversity in Dolling illustrates specific examples of fad behavior in the dolling community and explains why this is not good.