More information needed for someone to help... please click below and provide the requested information
-Information FAQ http://forums.adobe.com/message/4200840
Also, For CS5 and later, the easy way to insure that your video and your project match
See 2nd post for picture of NEW ITEM process http://forums.adobe.com/message/3776153
-and a FAQ on sequence setting http://forums.adobe.com/message/3804341
>just learning
The tutorial list in message #3 http://forums.adobe.com/message/2276578 may help