getting images from "pictures" on PC to tablet

[ADNelson]

I am a totally new Android user. In fact, I don't really understand Android and Galaxy and Samsung vs Motorola and I'm confused.
However, today, I have great pictures and other work pdf's on my Dell and I want to have them in folders on my Tablet. TMobile helped me a little by troubleshooting how to manage the "gallery" while the tablet is acting as a removable harddrive...? anyway, need help...