Luke Ranieri has some of the best advice on learning Latin. But note, even though Lingua Latina Per Se Illustrata is one of the best Latin books available, he doesn't recommend starting with that. It's more effective to first learn your noun, accusative, dative, genitive, and ablative cases, plus verb tenses and moods, by brute memorisation. Then move on to the Ørberg readers: http://wcdrutgers.net/Latin.htm