You will to purchase the fonts it needs, although most templates I've seen use free ones which a google search will find. Then you need to install them.
As to relinking you just do exactly that, go to the links panel, click on a link with a yellow triangle or red circle by it, then click on the chain icon to relink it which will bring up a box where you have to find the file.
I can tell you now though that if you're having problems with these basic issues you're going to run into all sorts of other questions. May I suggest lynda.com or buying a book. If you search enough you can find quite a few free videos too, but lynda is by far the best. The Adobe Classroom in a Book series are very good too.
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