Your a brave soal to take on slackware.

Slackware was one of perhaps 3 distros If i recall when I started using it in 1996. It was a tough way to learn linux but is rock solid and very stable.

There are a lot of readups on it. Make sure your hardware is in the HCL better known as the Hardware compatability list. Then download the ISO for your particular CPU type be it AMD or INTEL and start the install process.

I have been running slackware for my asterisk box for a couple years now and has proven mostly reliable with the exception of a occational reboot.

Good luck.