These are my recommended procedures for front and rear derailleur: Park Tool Co. » ParkTool Blog » Front Derailleur Adjustments Park Tool Co. » ParkTool Blog » Rear Derailler Adjustments (derailleur)

Start at the beginning and do not skip any steps. There are no guidelines for cable "tension", which is actually a misnomer, you are adjusting the cable LENGTH with the adjuster, the derailleur provides the tension. The length is adjusted for correct indexing and the tension is what the derailleur provides.