Q: Where do I find out how many GB's my iPad has on on it??? Not how many GB's are left but how many I bought with mynipad

Go to this link and look up your model number (look on the back of the mini...you may need a magnifier)

http://support.apple.com/kb/HT5452

Settings -> General -> About -> Capacity

That will be available capacity, so less the iOS itself and included apps and such.  A 32GB device should show about 27.9GB, a 64GB about 57.1GB - again, that is iOS file system formatted capacity less the operating system and other essential files.