how to make microsoft office the default programs?

Find a file that you want to open with Office. Right click or control click and select "get info". There should be an option there to say what program you want to open the file with. There should also be something to check to tell the computer to open all files of this type with that program.

Hope that makes sense. I am not at home nor on a Mac at the moment so I can't say exactly how it looks and what it says.

 

Here's a screen shot: