I guess you need formate your report page size so that it fits on one page (print page)....you want all charts on A4 size page that means 8.5 inch*11 inch page.
So first make sure that your report body width is less than or equal to 8.5 inch and your body+header+footer height is no more than 11 inch....
As you are using all the charts there are no region that can expand with data (like table or matrix), so by fixing the total report size will solve your problem ..
And also check the margin of the page.....go to report>>report properties and in the layout tab .....make margin size to 0.