After buying a hp Deskjet

after buying a hp Deskjet F380 in a sale I have not received some of the contents. The mains lead I have is only short and the machine end is to large for the machine. It may be that an intermediate box is necessary with a smaller plug to fit in the machine. Also I dont seem to have the software and directions or the usb lead. I wondered could you advise me of the steps I should take. The problem is I was busy when I bought the machine and never checked the box for contents or I may have mislayed them, I am not sure now as it was a couple of months ago.