Strategic financial management refers to study of finance with a long term view considering the strategic goals of the enterprise. Financial management is nowadays increasingly referred to as "Strategic Financial Management" so as to give it an increased frame of reference.
A mission statement is a brief declaration of an organisation's purpose and values - the reason why it exists. Your mission should be a long-term statement of intent deriving from the vision that originally inspired the organisation to form. It shouldn't be a detailed list of what you will do, how you'll do it and when.
Focusing on your mission will help you move your focus from what you do, to what you want to achieve. Once your mission is clear you'll be able to set strategic goals (both medium and long term) that set the direction of your organisation.