Rob
You need to provide a lot more details or this question can't be answered. For example:
Where will the fill material come from?
Who pays to haul it in?
Does the material need to be processed to meet specifications?
Does water need to be added?
What level of compaction is required?
What level of finished grading is required?
Is this part of a larger project?
Where is the project located?
Are the contractors in your area busy or waiting for work?
Will you pay union wages?
etc., etc.