I can't figure out how to turn it back to standard video. I exported the frames, put filters on them, now I am trying to import them back into a standard video.
It sounds like you're dropping the individual stills back onto the timeline. By default Vegas will set them to be 5 seconds each, just like any other still. What you should be doing, assuming your pictures are named with sequential numbers (pic0001, pic0002, pic0003, pic0004, etc.) is to use the File / Open function, select the first still, then check the box that says "Open image sequence". This will treat the entire selection of stills as a single video event and import them at the project's current frame rate.