Killa_ken said:
How do i find those out?
Oh, terribly sorry.
When you open your image in Photoshop, edit the Image Size (Image > Image Size) to get the picture size as you want it, then choose the File > Save As option and move the slider until you get the balance between quality and filesiza that you are after.
Or you can just right-click on the original JPEG, choose Properties > Summary > Advanced and copy down the vital statistics. Usually these are the most useful:
Camera | Focal Length | Shutter Speed | Lens Aperture | ISO Speed | Metering Mode |