Download the iTunes installation file and install it on your computer. Just type ‘iTunes download’ on your search engine and it will route you to the direct link on Apple’s website from where you will be able to download it.
After the iTunes is installed, an icon will be placed on your desktop. Mac users can open the file by just one click while for other PC users; they should double click on the icon.
Select all the media files that you wish to transfer and drag all these items to the main window of iTunes as this will allow you to copy the files to your device. Make sure that you have selected all the files you wish to copy to your device and there is no duplication in the items you have selected otherwise you will need to plug in your device again to remove the duplicated content.
Now is the time to attach your iPhone to the computer via USB cable that will be provided to you by the seller at the time of purchase.
Now all you have to do is follow the directions that appear on your screen and by clicking on ‘Sync’ all the files will be copied to your phone.