Hi Debbie. How long is the total timeline you are making?
I think you need to change your Project settings from the Internet 480-30 ( 640×480 ) to the NTSC Standard ( 720×480 – 29,970fps) and make sure the pixel aspect is 0.9091 ( NTSC DV ).
Then try to render again using the render settings you tried Memory stick SD NTSC – 2128kps which is set for the same aspect. There should be no need to adjust bit rate…
It should not take a long time to start rendering so clearly something is not right and as you have used your PC for Video editing before than I assume it should be OK .