The motor im talking about is in the link in my next message! 
How can I use it with Arduino?
Also, how do I know that using this, will not destroy or overheat
any part of the processor?
The arduino I use is called: Arduino Duemilanove USB board
Im totaly new to chips and stuff, I only done programming..
I want it to be able to spin a certain time a certain direction.
So, you know if it will work?
Thanks for helping me out!
//Andrew
Theres the exact motor I got my hands on now 
It's impossible to say, there are no data. It's always a good idea to buy parts with data sheets. It will require some form of driver, like a MOSFET; you won't be able to connect it directly to an Arduino output.
Okej, I understand.
But can I put some secure stuff wire around it, so if it mess up, the securewire will break, but the electricity wont make it around to mess up more components?
Also, I got other engine options.
1st is a 2.6 or 300 MPH (scale) engine, about same size as the first motor I mentioned.
BUT it could also be 1.0 or 150 MPH (scale) depending on the orgin seller, which I dont know.
Is any of those dangerous to connect to my Arduino?
You can connect virtually anything electrical to the Arduino if you know what you're doing. You can't connect most motors directly you need other circuitary to do the heavy stuff. To be able to say what you will need we need some electrical specs for the motor. It probably won't be much more than a transistor of some description and and a couple of resistors. Scale speeds don't mean much, the volts and amps the motor is going to need is what its about.
Okeej.. starting to get confusing, as I dont know much about electronic stuff..
But I do know how to read text of a batteri
Heres what the battery says:
1/4AAA
120 mAh <-Thats the volt right?
So, from what I understnad, I should connect the battery to something looking like this:
Seem to have only one input to me..
From what I know about electricity, I would need the electricity to move from +>- or the other way, anyways, that would require 2 connection spots right?
120 mAh <-Thats the volt right?
Wrong - that's the capacity.
In theory, the battery will provide 120mA for one hour.
If you can't find the spec. for that motor, ditch it and find one that does have a specification. We will then be able to help you.
From what I know about electricity, I would need the electricity to move from +>- or the other way, anyways, that would require 2 connection spots right?
Do you want to learn electronics the right way, or do you want to spend a lot of money burning stuff up and getting frustrated? If its the latter, I can't help you; however, if it is the former, then...
Find a copy of this book - any fairly recent edition is OK; if you can afford the latest edition, go for it (however, since it is a textbook, it might be fairly expensive - older editions will work OK, though, but be aware that this book has been in publication for many years, so don't go back more than a decade or two):
This -is- the book used by the majority of "Electronics 101" classes; it will teach you -everything- you need to know; it starts off with the basics, ie "what is an electron", and goes from there.
Another handy set of volumes to purchase are the "Engineer's Mini-Notebooks" (or the equivalent book series) that were authored by this guy:
Finally, you may want to check out this site for more beginners direction:
In my opinion, you're attempting to fly, when you haven't even learned how to roll over onto your stomach yet. You need to learn the basics. Get yourself a multimeter, a breadboard, and a set of really basic components (some resistors, some LEDs, maybe a few transistors and capacitors), and start learning. Prepare to encounter some math (a lot of math, actually, if you want to do this right). You aren't playing with Lego here; it isn't simply "plug in and go".
You can certain pretend it is, however - and spend a ton of money burning up components and getting frustrated, and asking a ton of basic questions - most of which will be answered by the references given above. But in order to avoid that, you must be willing to be patient, and take your time learning this stuff. Many members here have been working with electronics for 20 or more years, and all of them still have their own questions from time to time; they all still learn something new, possibly every day. If you aren't prepared for that kind of dedication, you will have a very frustrating path ahead of you, I'm afraid...
Good luck, and all the best to ya!
I understand that Im going into deep stuff.
I meen, I havnt been taught a thing about C++, but I still manage to create codes because of former knowleadge in java,lua and python.
Also, If I am to affor some engines or material to build my robot, I have to go for free online books. As this I found:
A bit more of a reference than an explaining book, but ohwell
Also got a little knowleadge from school, built a simple "dont touch the wire with the ring" game.
Also, my dad is very good with electronics, so even tho I try to do these stuff myself, If I get real stuck then he can help me.
Just dont want to bother him too much
And the math part, I got my calculator next to me so BRING IT!! XD
Start off by reading this:-
and learn the relationship between current voltage and resistance.
Then:-
http://www.thebox.myzen.co.uk/Workshop/Motors_1.html
will show you how to control a motor.
And the math part, I got my calculator next to me
I think you're confusing arithmetic with mathematics.