LOL, I was just getting ready to make my first post on this forum when I saw this one!

Since I'm having my own problems with Wine I'm probably not the expert here- I
think Wine might be causing a problem because I changed some settings... So be careful changing the settings! However, I think I can answer your questions.
Most tutorials tell you to use terminals a lot, because if you know what you're doing you can get stuff done faster, and it works on all distros. And Linux people are like that.

A terminal window is just a place where you can type commands. To get one, go to Programs>Accessories>Terminal. You can also type commands if you hold down Ctrl and Alt and press F1 (Ctrl+Alt+F7 to get back) but you can't paste stuff into that (as far as I know) so opening a terminal "window" is easier. Just paste in the first line and hit enter, then do that for the second line.
Now that you've run those commands, you're ready to install Wine. Open Synaptic Package Manager (in the System>Administration menu) and use the Find feature to search for "wine". Click the box next to the name and select "Mark for installation." Now just click the apply button and answer yes to the warning box. When it finsihes downloading and installing, you can use Wine. Now, there's no guarantee that your program will work in it out of the box (many don't) but if you just double-click the .exe file, Wine will try to open it. You might have to wait a few minutes, and it doesn't give you any progress indicators; the program will just open after a while if it's going to work.
IDK what Wine Doors is- maybe someone else knows? Let me know when you get Wine installed!
Frosty