Before you gain experience as an adviser, you could do reception or admin work for a counselling or advice service.
This will give you contact with clients, without having to advise or counsel them. Alternatively, you could work on an information desk. There are also telephone advice services working from call centres. Voluntary work is a good way to gain experience.
Things you need to know
Law Centres Network
Law Centres defend the legal rights of people who can't afford a lawyer
A free 24-hour counselling service for children and young people