ISSF Rule Book is your friend.
Specifically, Section 6.4.5 Shooting Distances (Page 213)
10m Ranges call for the centre of the target to be at 1.4m, +/- 0.05m (5cm).
As for firing point, the line should be 10m from the target face, +/- 5cm, and if you were laying out a range, each lane is 1m wide.
Tables should be between 0.7 and 1m in height, and the nearest edge placed 10cm forward of the firing line. Clearly your foot can't be over the line, but your arm/pistol can be. You can imagine how unworkable it would be to try and ensure everyone's muzzle was exactly 10m from the target given differing physiques and arm lengths, so the firing line is the line and if some people get a 3cm advantage from a longer arm, then tough!
If you have a gander here, you can see the positioning of the tables with respect to the black line on the floor.
"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud
Shooting is my meditation