Welcome to LQ
Firstly, go to http://iso.linuxquestions.org/
to get the Slackware iso - note: version 11.0 is imminent if you are prepared to wait, otherwise 10.2 i the current release version.
Then check out http://www.linuxquestions.org/linux/answers/LQ_ISO
for instructions on burning your iso file. Then go to http://www.slackbook.org/
for installation instructions and finally go to http://shilo.is-a-geek.com/
for configuration options.
I'm sure that others will come by with other links, but these will get you started.
Incidentally, this is the official Slackware forum, so we are very able to help you.
Oh, and the Slackware website: www.slackware.com