It is designed to be used off of a usb stick or cd/dvd .
Having said that there are tons of other differences between the two but that is the fundamentals of it.
If you are planning on using BT then I would suggest you do some heavy reading here on the forums. There is a ton of info to get you started in not only BT but linux as well.
Have a look at some of the "sticky" threads in the newbie section and also have a look through the tutorials and guides section as well.
As for your mac book install there are a few threads on that in the tuts section of the forum
Also a good way to navigate around here is to use the search function at the top of every page here.