Your first appointment will be a time for you to tell your side of the story.
It can be helpful to make a note of the following ;
Relevant dates such as date relationship started, date of marriage, date of separation.
Assets and debts for each party at the start of the relationship.
Assets and debts at the current time and since separation.
Contributions of each party during the relationship - both financial and non-financial such as the care of children and maintenance of the home.