Start with anything that you know that you need.

Write the reviews.

Write a function that can read the file and pull up a review.

Write a script that hooks said function to a web page.

etc.

Looking at the whole thing it will always seem impossible. But break it into useful pieces and start doing those pieces. Leave the hard parts for later. More often than not you will find that in the end there were no hard parts.

The key is to tackle it one thing at a time.