Hey guys! I am so appreciative of all your help! I am much further and figured out the other issues with the content.opf and toc.ncx file.
Now I am at a new phase. I am running into a certain image issue.
After a full page image (coded at required 600x800 size) there is a blank space after each. It doesn't show on Calibre (which I've only used for visual) and it doesn't work on Sigil (which most of it is hard coded, rather than assisted, other than the stylesheet).
After each image in iBooks (iPhone) and even the Kindle reader, show a blank space after the full page image (which is a chapter intro image).
Any suggestions/help? Thank you!