How to set up itunes on new laptop without erasing my iphone data?

I just bought a new laptop and want to setup the itunes. Problem is i'm not sure what will happen once my phone syncs to the itunes. I don't want to lose any of my pictures or music. Is there any way that is possible?

An iPhone can be synced with only one iTunes account at a time. Once you switched iPhone to a new iTunes account or a new computer. You have to authorize the iPhone to it in advanced, then you can upload files from the new iTunes to your iPhone. But this way will overwrite the original files on iPhone with the new iTunes library. You may try this iPhone file manager, it can help you copy files from iPhone to computer for backup, you can also use it as an iTunes alternative to upload songs, photos and videos. It will not erase your original iPhone files.