No, don't blanch soft fruit, it's perfectly OK frozen as it comes. I have some shallow plastic boxes ( from takeaway meals, I think) and find they are perfect for raspberries and blackberries. Blackcurrants and gooseberries and chopped rhubarb I just bung in a freezer bag - I don't find they clump or stick together much.
Otherwise you can cook them (e.g. gooseberries, apples, rhubarb) and thaw when you want to use them in puddings or as fruit purees.