Hello, and welcome to LQ.
1) I'm not sure what do you mean by admin tools. Most of settings for standard users can be found using GUI tools - which are available in "System settings". If that's not sufficient for you, you can always edit configuration files directly. (It might, however, require some "true linux skills", and I wouldn't recommend this to you unless you know what are you doing).
2) Newer Ubuntu versions use grub.cfg as replacement for menu.lst configuration file. You can edit it by hand, but it's no good in long run, as this file is dynamically generated by grub scripts (usually located at /etc/grub.d/). Take a look at some Grub2 tutorial - this one seems to be good for Ubuntu: http://ubuntuforums.org/showthread.php?t=1195275