1) After CPL, get an instructor rating - course is around 30 hours after a pre-course test and hour building to 200(?) for fixed wing; I know it's 250 for rotary!
2) The restriction is removed after you have sent off (I think) 25 student solos which are actually "supervised" by an unrestricted FI.
3) Square root of diddly-squat!
Cheers
Whirls