1."Hola, que tal?" (oh-lah, ke tahl) (hello, how is everything?)
2."Buenos dias, Como esta usted?"
(Good morning, how are you?) (afternoon: tardes, night:noche) also, if you prefer a little bit more informal greeting for someone of your age, you delete the usted, because by adding the s to "esta" the other person will know you are reffering to them, so you use:
"Buenas tardes, como estas?" (good evening, how are you?)
"Buenas noches, como estas?" (good night(s) how are you?)