Hi,
1. That solution is correct. If it doesn't change anything, it means that either you're editing the view file for another template than the one you're using, or you're not editing the correct view file (for example, if you changed "layout on product page" setting, you'll need to edit the show_* corresponding to your layout).
2. It depends. We would need a link to the page to be able to analyze how you have your product page in order to provide a precise answer.
3. In that case, don't do the modification from point 1 and instead create a custom field of the table "product" via the menu Display>Custom fields. That way, you'll be able to enter the text that you want on the right within the custom product field, and you'll be able to enter the text that you want in the bottom area in the normal description field.