Your divorce lawyer will need basic biographical information from you along with financial information.
It is important to gather as much financial information as possible including a list of all assets (i.e. property you own, bank accounts, stocks, retirement accounts, etc.) and all debts (i.e. credit cards, mortgages, bank loans, etc.).
This information is helpful when preparing a Separation Agreement and is also necessary if you cannot settle your case and have to resolve it through the court system.