Hello, that’s a lot of very basic questions and, unfortunately, I have the feeling it would be quite difficult for you to figure it out on your own. It would take less time for me to prepare a demo page, rather than trying to address all your questions. So please just let me know what exactly you need and I will pack a demo for you – which one of these:
1) Complete navbar .sm-mint
2) Full Width Mega Menu
A note about the Bootstrap addon – if you would like to use the “sm-mint” SmartMenus theme, you don’t need the addon. The addon is needed in case you would like to use Bootstrap’s theme.