TouristWay supports both Windows and Unix/Linux platforms, all you need is:

• MySQL 5.0 or later
  
• Perl 5.8 or later
  
• Apache (or IIS on Windows)

Getting to the hardware, an accurate evaluation would require detailed information that you probably don't have at the moment (how many products you will insert, how detailed the information will be, how many users you expect, their usage pattern, etc) and would still be our guess.

However a reasonably modern BI-processor server with 4GB RAM should be considered as a entry-level setup. For those providers who still count the  storage space, it entirely depends on the type and amount of information you plan to upload to your catalogue, however we certainly advise for nothing less than 250 MB.

Beside the technical considerations we often use to summarize this answer in a brief advice.
Given the extremely affordable rates of high-end dedicated servers it's certainly wise to go for the best configuration that fit in the project's budget. An online booking engine is a very demanding application and usually business-critical, thereby we strongly suggest to play safe unless you are willing to consider an hardware upgrade in few months.