How to define Project Objective and Developing Strategy?

You need to consider the main parameters of Project Management (Time, Cost, Scope and Quality) when you build your project objectives.

Do not forget the main questions WHO, WHEN, WHAT, HOW, WHERE (main questions of PM):

Who is the target group
Where is the target group (geography)
What is the product to deliver
When is the product to be deliver
How is the product to be delivered

Once you have defined this you can start making your WBS. You can use LFA as a tool to identify the problem, goal and objectives for your project strategy, for example:

The strategies you put to achieve your objectives and goal will lead you to put the activities and assign the required resources (human and material).