Proper engine warm up procedure?

[the missing link]

I leave mine set pretty low , but I don't leave it idle at all expect for at lights type thing . I always bump mine up to 900 or 1000 , it doesn't hunt for rpm at 1000 as bad and will stay a lot warmer in our tropical climate .
The reason for my idle set at 600 is for " lifting super bs " I believe it's a lot easier on the clutch . I am probably way out to lunch , but that's my program ...
Oh and yes I know I need to fix it , a year and a half I put 3600 into it and never fixed it . This breakup she is probably getting 3 new injectors