Many users are taken back by the completely new fangled screen that displays on first boot-up of Windows 8. But just thinking of it simply as a full-screen start button panel.
Just as with Windows 7's start button menu, you can simply start typing even though the search box is not visible, just type the name or a few letters of a program to display app names that match the letters you type. If what you're looking for isn't there, say, you want to run the control panel, switch the right-slide selector bar to Settings; if you're looking for a picture or doc, switch it to Files. Note that you can also search within any of the apps listed below these three choices.