I suppose you should start with "The Life of Pi" as it is his most famous book. It's the only one I've read.

I found it interesting and engaging at first but then it quickly became preposterous. I suppose that the ending, where the reader is presented with two different versions of Pi's survival tale, is supposed to provoke us to think about the nature of reality or some such crap. I thought it was juvenile and kicked myself for wasting my time on such a silly book.

So I would suggest that you read a different author first.