PUTTING FILL IN A YARD?
A landscaping business should be able to give you an estimate.
You may be able to move what you have got and create a pond at the far end of it, then push the dirt closer to your house to make a bank. The bottom bit will flood, but it will only be deeper water than normal. Ask some gardening contractors if they have any waste to dispose of - they can chuck it in your yard for free.
It will take an average number of average-sized bags. How the hell do you expect anyone to be able to answer this ? MEASURE the bloody yard.
you will need to do some math to figure out how much fill is needed clean dirt by me costs about $35 a cubic yard plus a delivery fee