Help ! I dont know where to start?

Strange! I try to burn the image from
LinuxISO.org - A place to learn about, download, and discuss Linux.
the second disk will not finish
Just as the disk is finishing it pops out - the index is not able to burn. -Using easy CD creator

You want to Md5 those ISO's before buring to insure they are the correct digest and haven't been altered.

You can get the Md5 checksum for your slack discs off of your distros site, and a MD5 checksum tool @ http://winmd5sum.solidblue.biz/

Md5 insures the integrity of your downloaded file is the same from its source,
and will also insure that it hasn't been modified (like having an installed trojan) from its original source. It also insures you have a sane (uncorrupt) file volume.

Hth

P.S. FreeBSD only requires 1 disc