This is the kind of thing I really want to be able to call you and talk you through. Very hard to type out xD Ill do my best.
Syncing your stuff (music, pictures, videos, etc.) to iTunes and back to your Apple Devices - (using Windows)
1. Using the charger that came with your apple product (I will use ipad for this example, but use the same steps for your iPhone or iPod) plug your device into your computer via USB.
2. If iTunes doesn't load automatically, go ahead and run it. Keep in mind that iTunes takes a second to come up, so be patient.
3. You will be prompted to register your ipad to your computer if you've never hooked it up before. This is a step by step process, just go through the motions. It's very quick.
4. Your ipad should automatically sync, but it wouldn't hurt to check the options to make sure it is going to import/export everything to the iTunes library. There will be tabs at the top of the iTunes screen when you are viewing your iPad. They should include Music, Pictures, Videos, and more. In each of these tabs, make sure the options are set to make sure it's importing everything.
Once everything from one device is synced, simply do the same for the other device, and you should have all your stuff!!
Note that your pictures from your iPhone won't immediately sync to your ipad. Those pictures aren't exactly compatible with that of an ipad. Don't ask me why
Hope that helps!!