I cannot advise you how to get into a clinical trial in USA, but I am in an oral drug trial in England and I have kept a detailed journal of my journey and all the appointments if you look me up! This will give you some idea of the commitment and time involved..allthough of course every trial is different and will have a different protocol.
Best wishes
Sarah
Try: http://clinicaltrials.gov/
Hope this helps,
-Shell