No editing allowed?

i signed up for a paid account a few minutes ago. creqted 1 video as a test, around 20 seconds long as 123 credits were used. (12% of my credits). I didnt like the video and so want to edit it. Am I correct in saying i get charged credits for the original video and subsequent credits to edit? So bascially I can use all my 1000 credits on testing 1 video?