At 17, you aren't going to have enough driving experience to pass the Institute of Advanced Motorists' Advanced-Driving Test, you will have to get out there in the Real World, and learn from your mistakes as much as your successes, for a few years, before you take it.
No company is going to give a Rookie of 17 a good deal, since you are a BAD RISK, and will likely have a pretty-big claim in the first three years (78% likelihood). You will find that insurance is lower when you have claim-free experience, you are over 25, and you can keep a clean licence. I have never had an accident, have 29 years of driving behind me, a clean licence, and pay under 300 a year for cover on my Mercedes-Benz, including Legal-Assistance and Europe-wide Breakdown-Cover. And that's just how it should be!
Make sure you don't take to the road ABSOLUTELY POTLESS, as cars have a way of throwing a bill at you, and if you can't afford to pay it, you will STILL have to pay your insurance, or face a big cancellation-fee!