the command to create a file... at the command prompt, type:
if you are in gnome or kde or some other(ie. the graphical environment), simply open the thing that looks like "My Computer" in windows on your desktop, eg. "My Home" or something of the like. then right click on any part of the empty space in that window. there will be a few options. select "create new file" or something that looks like that. basically, it can work like windows...
the command 'man', as abrakadabra explained, is short for the word manual. it gives you some information on the command you want to find out about. eg. typing:
will tell you how to use the command 'top'.
personally, i find the man pages some getting used to, so prepare to take some time on it. since u have a reference book, it should come in pretty handy when you sit down, tear your hair and wonder why don't unix people try speaking english
but when you do get used to it, it's very very handy.