Hello Hobby_Elec
If I was you, I would work though the tutorials at http://arduino.cc/en/Tutorial/HomePage as they give you a really good range of understanding as well as being really practical and easly ajusted to fit your own projects.
I would like something in which Arduino communicates with my PC.
for this you should look at the many "Communication" tutorals on the link above, like http://arduino.cc/en/Tutorial/SwitchCase2 and read up on the Arduino Serial input/comunication
You should also download the Arduino Programming Notebook by Brian Evans as it really brakes down the code and helps you understand the basics (im rubbish at code, so this book is like my bible at the moment!)
you can download it free as PDF here http://www.lulu.com/content/1108699
Hope this helps 