I'm posting on behalf of my 4.5 y/o son. He has Minecraft PE on the iPad and sees all these YouTube videos of Minecraft with actual people there. Do I have the wrong version? Does it need to be on the computer? Or does he have to be linked via WiFi to other players? How do you get an actual player/guy/person?
Minecraft pocket currently only supports Local WiFi.
You'll both need to have a device which has Minecraft pocket on it, and both be able to connect to the same WiFi network. On the main menu there are three options; Join Game, Start Game and Options.
Join game is the Local WiFi option. You'll both need to have set the 'server visible by default' option in the options menu.
Actual multiplayer may be coming in future versions (currently it is version 0.6.1) but it isn't ready yet.
The videos you may be seeing could be from the Desktop version, or possibly the Xbox version. Both are different versions of minecraft with separate features and options compared to pocket edition.