Blissfully Ignorant - cannot help with most of you problems I'm afraid but I think from 1/10 - employers will have to pay MW for 16-18 yos. It may of course just cause more problems for people of your age who fall between many regulations. Do you have a Law Centre or CABx close by who should have, or be able to refer you to, a welfare benefits worker?
Here in east London we are in the process of setting up a specific young peoples' service but we ar elimited to who we can see.
PS I have not heard many good reports from the Connexions service but they may be worth trying - they may well provide some form of advocacy.