is it because I don't water it enough or the soil? its outside every day its spring I put it on our porch
These cannot handle direct light. Make sure to keep it in the shade. Here is an article that will help you to care for the plant:
I\'m planting cherry laurel to make a hedge. They are 60cm to 80cm and are single stem or one small branch as seen in pics. A friend has told me to trim them back by a third to get them to thicken up whereas the nursery where I got them says give them a light trim in September. What should I do?
I would wait until early spring. This will prevent damage and allow for the best chance of recovery. These articles will help you care for you shrub: