and walrus, my first was blue velvet. thats what i would suggest to start off with.
My first was M Drive, then Blue Velvet, then eraserhead...where to now?
well, you could go 4 different ways IMO.
since you already have seen some of his more biziarre material you could either.
1. keep going and watch 'lost highway' and 'wild at heart'
2. take a detour and watch some of his more mainstream material like 'elephant man' and 'the straight story'
3. or you could watch 'twin peaks[fire walk w/ me]' which would lead down a diferent path towards obessesion and you will be forced to watch the entire series of twin peaks. honestly, i saw fire walk w/ me BEFORE i saw twin peaks[tv series]. and i still loved every moment of that series despite already being spoiled by seeing the film first.
4. lastly, you could watch 'dune'