how communicate with new friends? If i talk with a new friends, should i say "How are you" or "how do you do ". can I say"what's up" or "How is going"

my one day now I'm a Student, Learning in college, my major is software develop. Developing software often use English, so i want learn english. In the morning I will listen Enlish video to learn English, about one hours. then I will learn some develop Teachnonlogy,such as Java, .net,and others until before lunch. at the afternoon, I often try to say some English follow video, like Album family USA and the others ,so I can say simple English . In the morming , I learn some Chinese traditional Cultrue. that is my days. and I want make frinend with person who want learn Chinese .