you can add a second menu to TWENTYTWELVE. go to Appearance, then select menus. There is a + sign next to main menu near the top of the page and call it custom menu. it should appear as an available widget. you can then add it to the main sidebar area for all pages except the home page, and to the first front page widget area. to move it to the left side of the page. For the main sidebar widget to move from right to left, use this bit of code in edit CSS (which is part of the jetpack)
/*– move sidebar to the left –*/
@media screen and (min-width: 600px) {
.site-content {
float: right;
}
.widget-area {
float: left;
}
}
/* for IE8 and IE7 —————-*/
.ie .site-content {
float: right;
}
.ie .widget-area {
float: left;
}
Not sure how to move the first front page widget area, but I am sure it is something similar. As far as creating the block format for the menu, I would like to know how to do that also.
Hope this helps
