The Holy Trinity of Translation is Language Proficiency, Specialization and Writing Skills and the ideal translator is a seriously bilingual and bicultural lad or lass with several years of work experience in absolutely any one field who writes great emails and loves crosswords, anagrams and the like.
Fluency in another language means being able to comprehend, speak, read, and write in that language at the level of an educated native speaker. Being fluent is only the first step in becoming a professional translator or interpreter. Like any other profession, it requires practice, experience, and training. There's no one path to success, but we can get some way from class.