Thanks for the suggestions gents
I will be doing the stock agency submissions as a matter of course to tap into that market but as I have outlets via some shops in Munich and plan to do some of the fairs and markets over Christmas I want to be able to point the potential and repeat customers to my website and hopefully "catch" them while they are there, hence me wanting the inclusion of a shopping cart.
I do like the idea of having contact with people so that I can then keep them informed about where I might be offering my work for sale in the future, be it a market or (being optimistic) a show. The drawback with that is unless they hit the buy now button and pay, they can always sleep on the decision and that could possibly lose me impulse buys.
Getting all this sorted has now become a priority and is not easy; all I wanted was to be a photographer