Side bangs or none. Not a fan of straight forehead bangs but you can wear both types. With straight bangs it's hard to change up ur hair look and I think u won't like it after u cut it
It really depends on what kind of bangs you want. Depending on your face shape, some cuts are more flattering than others. You can look on this site: http://www.stylelist.com/view/find-the-best-bangs-for-your-face-shape/ for ideas on what kind of bangs you can get. As for your layers question, layers look great on round, oval-, and heart-shaped faces. However, if you do get bangs, the layers might make your haircut too much.
Something about girls with bangs makes me go ape wild.
Considering that your forehead looks like the parking lot at Walmart, you will most likely never get banged unless you do something to cover it up. They could land a plane on that thing.