You enter 'adduser' (without the apostrophes, of course) and set up a regular user account to avoid being logged in as root. After that you log out (using the 'logout' command) and log in as your new user. Then you 'su' (gain super user privileges; first 'su', then enter your root password, which I hope isn't 'SlackWare'
) and run 'xf86config' (since you're using 9.1; in 10.0, use 'xorgconfig') in order to set up X. When that's done, drop the super user privileges ('exit') and fire up X (assuming you want to get graphical
) by the command 'startx'. If you want to switch window manager, use 'xwmconfig'.
At this point you'll probably want to tweak some things, but I definitely recommend you to set up a decent firewall first (that is, a set of
IPTables rules). You could use a frontend (such as
Guarddog,
Firestarter, or similar), a ruleset template, or you could write your own ruleset from scratch. IPTables is part of the Linux kernel, so all you have to worry about is how to create your ruleset. Both Guarddog and Firestarter can be found as Slackware packages at
Linuxpackages, in case you don't want to compile them yourself.
When that's done, you can take it easy and get comfortable with Linux. Check out
Simply Linux for some general configuration tips...and if you have any questions, use the search button.