Girls tend to stare at you for a long time and blush when you stare at them and if you stand close to the and they don't move away, they like you
Go as long as he wants to. If you need help read twilight
Depending how old you are, ask her to marry you
People now a days are having them under 22 years, but nomal people have them in late 20s early 30s
What is interested in? If it is books buy him some! Ext.