Now that your card is formatted properly, have you done anything to manually transfer files over to it? Android will not automatically migrates files to the card, so you'll have to do it yourself to free up internal storage.
The proper way to do this is to use the copy command, not the move command. If something glitches and the paste part of the function fails, the copy method retains the original files to try again. The move method deletes the original and holds it in memory until written to the new storage location, meaning data loss if it fails.
I think this might be the missing link here, and what would enable me to not just take and store more photos, but also update more apps.
Okay, so I guess what I have to do is move pictures to the SD card (pictures make up the vast majority of my postage space). So the way to do so is long pressing? My only concern there is that I just have the pics splattered all over the gallery page, not in folders. This means that it would get extremely time consuming to do this. Is there no way to do something like "select all images from this point down" or something like that? Also, if I'm successful, how do I access the images that are on the SD card? Thanks.