have you bought the seed or collected it Guest ? most tree seed needs a period of cold which naturally happens in nature , if this hasn't happened over the winter try mixing the seed with a bit of compost and puttin g in the fridge for at least a month and then putting in a pot, its usually better to do this in the autumn as the process happens naturally and the seed is fresh
seeds are variable and if they do germinate you could have all sorts of little acers-- some good --and some not--- interesting though!