Well, first of all, since I guess you come from Windows, I recommend you to read this:http://linux.oneandoneis2.org/LNW.htm
It describes some differences between Linux and Windows, so you know what to expect. Secondly, I would say that you should read, as said on some posts above, because any info you would need is really out there, you just need to find it. I have had some doubts, but if you google about it, you will find the answer. If not, ask here. However, there is something called "man pages" (from "manual"), that come with Mint, and is a good source of information, although it is sometimes too much to read. Nevertheless, typing on the command line "man" followed by a whitespace and followed by the name of a command (program) will open something that will show you how that command is used. It is really helpful since sometimes you will need to use the terminal and it would be good to know how to use it. So if you use "man", you should know a couple of things:
1) Inside the manpage, you can scroll down/up/left/right with the arrow keys, although you usually don't need to scroll left/right. You could also use the space bar to scroll down page by page and pressing "b" will do the same, but scrolling up. To quit, press "q" on your keyboard.
2) The command "man -k" (or command "apropos") followed by a whitespace and some text will search manpages containing that text
Don't be afraid of the command line. Sure, it could be something new and probably you won't know the commands, but with time, you will see that is not that complicated. In fact, it can save you a lot of time.
Also, there is something called the "super user" or "root". Never log in as the super user unless it is strictly necessary.
Whenever you use something like "sudo" on a command line, be sure to type things correctly, check as many times as necessary
, and be sure you know what you are doing. Being the superuser means having complete power over your system, and that can be dangerous (if you mess it up being superuser, you're screwed). Doesn't mean you can't solve whatever you've done as superuser, but it's better not to have to solve those problems. When you create your user account during installation, that is not the superuser, so don't worry. In fact, I think the superuser account is not really created on Mint.