Normally you look in the datasheet.
as @dchisholm said above:
In the Datasheet on page 10 you can see all required measurements.
(mm and inches, be carefull what your settings are.)
The only thing to keep in mind is that normally the position of pads is relative to its center.
For this particular footprint i would create a pad of size 6.2x5.8mm at (0,0)
Two smd pads are placed at (6.68,±2.285) and have a size of 3x1.6mm
Details see drawing.
For the future:
it is much easier to help you if you have one question per thread. So please if you have a new unrelated question open a new topic.