There is absolutely no need to wander here and there or spend money buying a book, unless you find it hard to read from a computer screen. All the macromedia softwares have very good tutorials and help sections, which can easily be found under the help menu. They are very systematic and very comprehensive.
Apart from that, joining some related community,groups and reading blogs is also a good idea.The only demerit in doing so is that, people in such places are not very different from real world, so most of the times good tips are not shared very openly.
