Well, we learn by doing that's for sure and what I recommend is that you set up a dev site either on your server or on your hard drive so that you can make changes and experiment with different things without messing up your live site.
What I recommend doing at this point (and bear in mind I use vB 4.2.x), is to revert all of the templates you changed (they will likely show up in red if vB 5 is like vB 4 in that regard), but first save any templates you want to keep on your hard drive as text files so you don't completely lose all of your work. See if that at least gets your site running again.
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