how to get isdn going on linux?

hello,
first of all, i suppose i better say that i'm an absolute n00b with linux..
i'm using slackware 10 atm.. i want to get isdn going.. where do i start?
i have two modems, one internel asuscom isdnlink, and another external
dreytek one.. i dont mind which one i get going, so long as i get on 64k..
i downloaded and installed isdn4k-utils, but i dont have a clue how to use
it.. just way to complicated for me.. are there any good graphical tools i
can use to configure my modem(s)? or can anyone please point me to some
good howto's or documemtation on isdn for linux (i did try google, a bit)?
i'm using the 2.4 kernel (slackwares default) but if i must upgrade to
2.6.7, i will..
any ideas?

thanks,
piratePenguin