It's not tricky
Get your wax (either from a craft shop, or old candles) and your wick (again craft shop... though normal string can work too (not nylon or synthetic though))
When I've done it I used to tie a small washer to the end of the wick and then use something to suspend it across the mold in the centre so the washer was just touching the base
melt the wax by putting it in a container and then placing that in a saucepan of water on the hob, once melted pour slowly into the mold and leave to set. remove from mold and you have a candle.
anyhow have a look here
http://www.candlemakers.co.uk/
have a look here as well
http://www.candlemakers.co.uk/