If you want to make a cylindrical image, your images are going to have to OVERLAP, so your horizontal images cannot just be taken at 90degree angles.
That's just for a PANORMA.
If you want an HDR panorama that emits light, The photos need to be bracketed. That means each shots has to be taken at a regular exposure, then under exposed, then over exposed.
In your case, that means 6 shots x3 = 18 shots
-But like I said, to stitch them, they must overlap. Even more shots needed.>.jpg would be fine
No they won't
HDR images are used because they emit light and reflections..
making them a .jpg will get you reflections, but won't emit light.
For making a panorama, for starters,
Take photos with any camera/tablet and stitch them with hugin.
Try to make a full 360 panorama, which will do nothing more than make nice .jpg reflections.
If you can do that and want to take it to the next level, (HDR Light emitting panoramas) , You will NEED a tripod and probably a DSLR (some kinda camera that can take bracketed photos).
If you REALLY want to take it this far/to the next level, buy this book:http://www.amazon.com/The-HDRI-Handbook-2-0-Photographers/dp/1937538168
This stuff isn't easy, nor is it cheap.