I recomend you using the VietnamesePod101.com program. I think it's a good Vietnamese learning program for beginner. You can access the website: vietnamesepod101.com to know more about it. There are some of their podcasts are on Youtube as well.

A Ă Â E Ê I O U Ư https://www.youtube.com/watch?v=qUOq_qLZacc U shoud watch it, or call me by skype, i'll help you.