Overclock AMD Duron

Hi guys ,

SYSTEM :
1.OS - XP
2.Motherboard - ASRock K7S8X (Real Clock - 133Mhz , Effective - 267Mhz)
3.CPU : AMD Duron XP 1600 MHz (6 x 267) L1 .. L2 - 64 KB ; Voltage - 1.5 V ; Typical Power - 45~53 W ; Max Pwr - 57 W Depending on Clock speed
4.Memory - 756MB 3slots (1st - 512MB 200Mhz PC3200 DDR SDRAM , 2nd&3rd 128Mb !166MHZ!   PC2700 DDR)
5.Video - Overclocked already Ati X1650 256Mb

So my question is how much i can push this CPU and what about Memory can i change something there ?
Can you help me guys im Newbie in Overclocking CPU's   can you explain step by step...I watch tutorials and blabla but i cant figure OUT how to deal with MHz and VOLTAGE

Thanks in Advance ,)