Three-dimensional animation has many links, which are composed of prophase, metaphase and anaphase. Depends on which part you want to learn. In the early stage, I need to have a good painting foundation, mainly responsible for scenery, concept, mirror and other work, which is basically painting. There are many types of work in the middle and late period, and the requirements for painting are relatively low. I suggest you learn these things, such as MAYA, modeling, animation, materials and so on.
FLASH is not required for 3D animation.
Generally, it takes about 3000-6000 to come out to work, depending on the region and company, not necessarily.
These are all experiences, hehe, I hope to adopt them.