Hiya - Blackberry wine is really, really nice - maybe the best fruit wine. I've got one batch fermenting and one batch maturing in the garage right now! Here's my recipe:
http://cakeable.com/recipes/drinks/blackberry-wine
It's really easy - and pretty much the same for any fruit wine - 1-2 kilos of fruit with 1 kilo of sugar makes 5 litres of wine. Fruit and enough boiling water to cover goes in, cools down to hand hot, then add yeast and half the sugar. Wait a couple of days then sieve out the fruit pulp, add the rest of the sugar and leave for about 10 days (in a container with an airlock so it can bubble). Decant the wine from the yeast sludge and leave to mature.
There's other stuff you can do, like adding grape concentrate for body, adding pectolase to help clear, and campden tablets at the end to stop fermentation but none of these are strictly necessary.
The only important thing is to make sure that whatever you use is sterilized. I use thin bleach and rinse everything well under the tap after.