Neewb,charging woes.

[Dingbat]

Hello everyone.
I'm very new to RC and have recently acquired a
Competition Electronics Pitbull X3 charger.

I have three batteries.
1 NiCd 1900 mAh
1 NiMH 3700 mAh
1 NiMH 4300 mAh.

What charge rates should i be using and how long should it take to charge ?
Will the charger stop charging automatically ?
Should i be using single rate or triple rate charging ?
What difference will it make ?

I will apologise now for my supreme dumbness.
Sorry !
Any help will be most graciously received.