workflow general queries

In workflow defenition how a version can be defined ( I can see 0000 when i create a new workflow, how this can be changed or updated with new changes and how can i get 0001 number over there)

In workflow when i create a new task i can see many options for release status. Can u explain me the functionality of each status.

ie : Released

Implemented

Modeled

Obselete

How can i find the business objects for a specific scenario? Should i have to get help from a functional consultant to find out business object?