I think the point of the exercise is for you to create your own magazine layout, with columns, text/images boxes etc, as a way of learning the program. Using an already created layout would be pointless for your development.
I know you weren't asking for a full magazine layout design, but they're asking you to do this, simply to learn some of the bits and pieces in In Design. So using master pages, columns and grids etc. And obviously being on a design course, you'd want to design something yourself right?
Haha I love the direction this thread has taken. Back on topic. I just did a type project for uni in Indesign so I find your attitude quite... weird? you clearly need to learn all kinds of software. there's pleanty of tutorials online, get searching. Rather than a template, go a grab your favourite magazine and flick through that picking out what works well, then play with it and make it your own.
Really? You can't find the 'new' button? It's under file/new/document. Where you go from there is up to you. 'You' have to decide on grid layout, margins, etc. If you can't come up with an idea in your head and apply that to a programme then I'm afraid you're going to find the graphic design business a very difficult beast.
I don't want to come across as being mean, but as others have said you've been given this task to help you learn. I know you don't see a future in the print industry but there's more to graphic design than just building websites. You've been given this task for a reason and basic layout and aesthetics are the fundamentals of design. Applying those fundamentals to something as simple as a magazine is crutial.
If you're really really stuck, do a search on youtube for InDesign tutorials, there's tons of them. That'll get you started.
If your tutor has asked you to produce a magazine layout un-assisted it would lead me to believe that they've either taught you the basics already (and you weren't listening) or they want to see how much you know to best plan future lessons. Either way, finding short cuts really wont help you! If you're struggling, ask the tutor for help or advice on what's in the college library that may help you..
You've got a huge amount to learn about traditional graphic design and at this point in your career, the medium is almost irrelevant.