Hi there
It is very simple to add a new menu, it is a module type menu published in position-1.
So just add a new menu , add a menu item to it as Home , then create a new module menu type, select the menu you just created and assign it to position-1 ( you can also change position names editing your template ->Layout configuration -> Navigation tab) and in menu assignment for module choose the menu item you created.
Regarding positions you can manage them through layout configuration tab, adding or changing them from Top positions or Bottom positions.
Hope it helps