When you come to save, if you go to File > Save for Web there are various optimisation options to get that file size down.
Edit: and for physical size, 'Image size' can be found under 'Image'
edit 2: or, when you use the crop tool you can specify the dimensions you want it to come out as.
( ,
Sat 25 Jul 2009, 23:22,
archived)
edit 2: or, when you use the crop tool you can specify the dimensions you want it to come out as.