The following sites may be of interest
1] For information on all things viking go to;
2] There are many sites giving information on the Medieval Period, most of them are not very good this one is better than most [ and a lot better than some! ];
3] The Australasian Register of Living History Organisations gives a good list of most Reenactment bodies in Australia and New Zealand. If your looking for such an organisation this is where to start;
4] Many people now sell historical replicas. These are two I have dealt with. Both have a wide range of stock;
5] If you are interested in the Roman Army the Ermine Street Guard in the UK is probably the best known such Reenactment Group. It has long had a high reputation for accuracy;
6] The following provides a large number of photos of medieval paintings, illuminations etc. arranged by category. This may help in research.
7] There are many reenactment groups in Sydney. I am associated with the following three. I make no promises with regards to the currency of these websites.