For you or the kids, and what sort of card are you looking to amke- country homely or stylish pizazz?
docrafts website os very sueful for ideas, and I am sure I can link you to a great many shops if you need be, but personally ebay is a great starting palce for bits and bobs.
Consider how many you need to mke- one year I took an order for 300, was awful! I much rpefer a few ones I can concentrate on to a mass produced load.
Some of the most simple stylish ideas especially for beginners are the embossed stencil cards, with amybe some chalk for emphasis- these work especially well imo with snowman stencils and are cost effective (required: stencil, mouse mat, embossing tool, chalk, fixer aka hairspray)
but anything goes.