Does anyone know where i can find tips and tricks about film mixing: track-layout, using compression or not on dialogue-mix, plugins etc.
Sitting with an experienced mixer, is the best way to learn. I am a re-recording mixer, and had been mixing for a couple of years solo. I was hired by another studio, and the first year I wasters, I was teamed up o mix SFx with a Diakog mixer. I leant that year how little I knew about mixing dialog properly. And it was an invaluable year. What I learnt by mixing with the experienced mixer, helped me enormously when I moved to LA.
This is super-old news, but there's a really superb book from Mix called "Sound for Picture" that's full of articles and interviews. It covers all elements of sound from a bunch of enormous films and the biggest names in the industry. A really inspiring read that has a bunch of tips and tricks as well. My copy is from 2000, so it still contains a lot of pre-ProTools stuff, but that sure doesn't make it useless.
Otherwise, I think @Tim Prebble is right... sit with a mixer! Combine that with a lot of listening to soundtracks and some good reading and, for me, that's the magic cocktail.