I want to learn how to build games by using editors like UnrealEd and scripting languages.What should I learn from the qualification point of view and which editor,scripting language is the best and most used in the gaming industry?How easy is to find work with the above criteria?Is artistic abilities and architecture a must?Any advice would be appreciated.

There is no single editor and scripting language you should use. But companies generally look for popular editors like Q3 Radiant or UnrealEd. IMHO, I''d go with UnrealEd since it''s more current and has some newer features.