First and for most. Re size those pics man....
What you need.
1.Tripod
2.Camera
3.PhotoMatrix
If you want to get really good at shooting a HDR, you have to know your camera settings.
If you have a DSLR, which I recommend, Then you can go to your settings. you should have "Exposure Bracketing Setting" in your Settings menu. Just select 2|0|2 and you will take 3 different exposures at once.
This can be look at in this video here:
HDR Steps
Now, Once you have your exposures you can upload them onto PhotoMatrix and it gives you a step by step to achieve the HDR image.
then you come out with something like this Depending on how drastic you use Photomatrix