actually the first book is the interview but i know what you mean. chronologically the vampire lestat is the first (at least the most parts of it...the beginning and the end of it - the concert and so on - take place after the interview)
and queen of the damned (the movie) contains some parts from lestat book...but they changed a lot of things...eg there is no magnus, only marius etc...so this movie is a weird hybrid...it is neither qotd nor the vampire lestat...actually it has little to do with the books at all 😄
but you are right!! they should make a lestat movie, too... this is one of my fav books so id love to see its movie 🙂 maybe someday they will make it 🙂 lets hope 😛