I moved to L.A. from Florida when I was 18. I had a great time and am still here to this day.
$$$: Service industry is huge out here. Can you bartend? If you avoid the chains and find a hip, lively place, you can make 150-300 a night. My wife bartends in Hollywood and cleared over 85k last year working four shifts a week. You just have to find the right place. You also get $8.75 an hour to wait tables here. Which brings me too...
Where to live: Screw the Valley (Reseda, Tarana, Woodland Hills, West Hills, Canoga Park, etc). It is to far from the good stuff. Screw the westside (Santa Monica, Bev, Hills, Westwood), Too expensive. Beach Communities are nice but you might not end up ever leaving them due to traffic. I Like and live in Hollywood (Los Feliz, Echo Park, Atwater Village, Thai Town, etc) Lots of unique spots, great food, smokin hot girls (I'm married so that leaves some for you). There are a million places to wait tables and make sick cheddar, you can get around on a bike and you really get the full experience. Actual hollywood proper sucks, east hollywood is the goods.
Rent: If you have roommates, your personal share should be between 500-800 bucks depending on how swag you want to be. My wife and I have a 1 bedroom with a loft and 30 foot celings in thai town and pay 1350. The more roomates you have, the cheaper it gets. Don't sweat that number though, you can easily make 800+ a week waiting tables.
Hockey and School:
Please have a car. Glendale Community College is nice, has a great campus feel and is very affordable once you get residency. I payed exactly 0 dollars for my A.A there. Lots of finacial aid in CA once you quailfy. You can just take a few classes while you wait. on the way to/from GCC, you can play hockey at Pickwicks in burbank. Lots of games, easy parking and all skill levels available.
pm if you have more ?'s