I've never tried to make wine but I've got this old book (1957) - Easymade wine and country drinks and there's a receipe for sloe wine in it. If you want it it says:
3 1/2 lb of sloes
3 1/2 lb sugar
1 gallon of boiling water
gather and wash sloes. put in bowl pour on boiling water. stir round a bit. cover and leave to stand until thick mould has formed over sloes, can take weeks or months but it doesn't matter how long they stand. The books says the thicker the mould the better the wine.
lift the mould off carefully without breaking it if possible. strain liquid through muslin into another bowl. Stir in 3 1/2 lb of granulated sugar and cover bowl. leave for 5 days, but stir daily. the book then says that it is ready to bottle. it may need more sugar adding for sweatness, to do with the maturing process. try to keep for a year before drinking.
loads of this sort of wine receipe in this book. I don't know about wine at all. perhaps someone else who know should comment on this sort of thing before you have a go.