Welcome in the fascinating world of PSoCs!
Easiest would be to use the USBUART component. This emulates a COM port on the PC-side which you can access using HyperTerminal or a similar program. This ensures that you do not have to do too much programming on PC side. Look for examples on USBUART.
You have tried some of the examples in -
http://www.cypress.com/?rID=70131 AN82072 - PSoC® 3 and PSoC 5LP USB General Data Transfer with Standard HID Drivers
http://www.cypress.com/?rID=39553 AN56377 - PSoC® 3 and PSoC 5LP - Introduction to Implementing USB Data Transfers
http://www.cypress.com/?rID=39404 AN57473 - USB HID Basics with PSoC® 3 and PSoC 5LP
http://www.cypress.com/?rID=39327 AN57294 - USB 101: An Introduction to Universal Serial Bus 2.0
http://www.cypress.com/?rID=40103 AN58726 - PSoC® 3 / PSoC 5LP USB HID Intermediate (with Keyboard and Composite Device)