Hi bought some roses from a supermarket few months ago they were in boxes .Ifollowed all the instuctions and stood them in water for 24 hours before planting in pots put plenty of BONE-MEAL in the compost and put them in a sunny spot.Can anyone tell me how long before they start to flower As I am just starting gardening at 70-years old

They will flower next year. This year is a bit soon, they have spent their time establishing roots. keep the soil around them moist but not wet - water once a week if there is no rain. Although they were in boxes, they were probably dug up from their original site and put in the boxes for sale. This disturbs the roots.