Your #3 is the easiest to answer, so I'll start there.
Most package managers will let you look at the file list (often you select the package and can hit a tab or something that will show you the file list. With Synaptic, you select the file (mark it if you want), go to your menus up top and hit Package and then Properties way at the bottom of the menu. When the dialog comesup, you have an Installed Files tab right in the middle of the five. However, for some reason, you gotta install it first, unlike the RedHat Package Manager.
#2 and #1, I believe, means that you have to thumb through a bunch of code to find the scripts that do that. I suggest you install it, find it in Synaptic, and then view the file list to see where the command you must run has landed (if you don't know what to look for, try to poke at different files by running them in X-terminal if you know how to use a terminal, but a good starting place is that the name will often be similar to the program's marketing name, maybe /opt/wine or something to that effect for WINe.). Also look for "man" and "info" entries, as the man and info commands are used with the command's name as you type it in to give you information on the command in question. After you verify the command that starts the program you just installed, you can then make a link however you want.
If there was a script to put links on the desktop or the Gnome Foot menu, the easiest way to find it that I know of is to simply thumb through the menus until you stumble across it. Also, check the desktop and menus for the root user, as that seems to be a popular place to put a link, especially if the intended target-distro is Linspire.