Evey body hear was a nooby at one point in time. I have had my share of fail's over the years it is all part of learning and using that info the next time.
When your Computer boots there should be a notice to press a key like F1 F2 or Del to enter the BIOS be it UEFI or a older BIOS that part is still the same. From there you should see a option for BOOT. Use your mouse or arrow keys if the mouse is not enabled and select the BOOT option. From there choose the USB stick as the boot device.
If the USB key was made correctly you should see the system boot from the USB stick. However if you have Windows already installed on the system even if it is somewhat corrupt you may see "Press any key to BOOT" since the installer is detecting an already installed system. If you do not press a key it will try to boot from the hard drive any way.
As for making a bootable USB stick the best is to use Microsofts own USB Key maker
http://www.microsoftstore.com/store/msusa/html/pbPage.Help_Win7_usbdvd_dwnTool it is easy to use and will give you the best performance.