it really depends on what languages you already know, but i think you need to use both, and not starting with a book would probably be the most inefficient way to learn a new language.

if you already know spanish or italian, learning french is a lot easier because a lot of the verbs are the same and conjugations follow the same patterns

i know english, italian, a decent amount of french now, and if I am trying to learn arabic, starting with just radio and tv seems backwards to me