This is not really home brew, but I do Sloe and Damson Gin
Sloes are just smaller members of the same family that Damsons come from, given the pain in the arse it is to pick Sloes due to their size I go for Damsons these days.
First thing is to get a jar to make it in something like this
http://www.kilnerjar.co.uk/range/show/cliptops-round/ I use 3 litre ones, some recipes say to use a Gin bottle, avoid this as its a pain in the arse to get the liquid out when ready.
The assuming you are using a 3 litre jar, put 2 litres of Gin (can be any cheap supermarket stuff) 2lbs of Sloes or Damsons and 12oz of sugar (add more if you like sweeter taste)
Some people will say prick every piece of fruit, again this is a waste of time, freeze the fruit before you add it to the jar, then the berries will burst as they defrost allowing the juice to come out.
Stick the jar in a dark place and turn it every day until the sugar dissolves, they after 3-4 months pour everything through a fine sieve. Then take the liquid and pour in through muslin cloth or coffee filter paper and bottle in dark glass bottle (I use green wine bottles)
You can drink at this point, but I always put a bottle away for a good year as the taste changes with age.
I find Gin is vile on its own, you can eat Damsons but Sloes are disgusting to eat, but mix them together with sugar and you get a great drink!!