I'm not working in the industry, but i think you should be as alround as possible to get more of a chance, since you can apply on different functions.
You could also focus on one thing, modeling, texturing, scripting and so on and once your in learn the other stuff(in your spare time).
make a good demoreel and i don't think it should be more than 2 a 3 minutes.(i think those demoreel-watchers have a short attentionspan :p )
and most important keep trying

good luck