New setup question

I just built a new system. It is:
ABIT AT7 MAX2
AMD Athon XP 2600+ Barton 333FSB L2=512K, AXDA2600KV4D
512MB PC3200 400 Mhz DDR, single module
I am new to overclocking. Any idea what this system should be capable of in
OC speed?
At what CPU temp should I tell the Setup to shut down the system?

Thanks Guys,
Gene