In my opinion, get some professional help with a copy/rebuild of the site ie pay someone to make the new site, if you think this is out of your depth, although you could easily make a similar (and cleaner looking) site with a CMS. Make sure you keep a hard copy and have total ownership and control over the files. It looks like the images they gave you are simple animations and stock photo's and of course some of your own product photo's, all which can be obtained cheaply from a Google search (probably even free for the gifs). Please don't get offended by this, but the site could do with a makeover and with a host move, now is the time to do this.

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Miles Kitchen
Wedding Invitation Specialists