There are several ways to move your photos from your PC to your iPad.
(a) you can sync them using iTunes and transfer them all to the Photos app on the iPad. This is the easiest way if you have a large number of photos and albums to transfer. In addition, it transfers your existing album structure and sets up those albums/folders within the iPad's Photos app, something that cannot be done directly on the iPad.
(b) if you have just a few photos, you can email them from your PC to your iPad and then save them in Photos.
(c) you can use a third party app, such as GoodReader to transfer the photos via WiFi or USB
(d) you can use a cloud storage facility, such as Apple's MobileMe iDisk. You upload the photos from your PC to the iDisk and then download them from iDisk to your iPad.
Tim