(Bearing in mind this information/advice is given from an American law perspective.)
I was told by BMI that i wouldn't need any license to play it on the air because i would be using the radio station licence (nother words they are license to play that type of music)
Absolutely true. You are not responsible for the licensing fees since your production of the show does not legally constitute a performance.
I am also tying in the web-site that will allow people to vote for there favorite songs for that week the site will also carry pics of artist and include a link to there bio information or any new music coming.
It depends less on the fact that you're using someone's likeness and more to do with the source of the picture. That said, a record label would be brain dead to quash someone who is trying to promote their artists with a legitimate countdown.
My question is (and it sounds so simple) what I'm i missing in order to get this countdown rolling. do i have to get permission from the record label and if so how would i do that. Getting the music hmmm should i go through a music service like radio express or another ( Any ideas) I'm i goin have to buy a royalty fee???
As long as you acquire the music legally, you're in good standing. There are many options for this: CD, Amazon MP3, iTunes, and so on. A record service like Promo Only or Gold Disc would also be sufficient. If your countdown has any success, you might be able to get labels to give you "service", wherein they send you singles and advances for the very purpose of giving you easy access to the music.