CompuServe Messages

I am a new 3D Studio user and I am trying to use Video post to create a final animation. I have several animations and still renderings. I am try to decrease the size of the final rendering file by not adding several frames of the still renderings to create a 3-4 second pause on these frames. I have read all the documentation on the text editor to see if I can create a script file like in Acad or AA but have the ability to combine stills with animations at a 640X480 res. At the present time it looks as if the file is all ready going to be around 80-100 meg without adding the several copies of the stills. I have been referanced to create N-frames but havn't found any thing in the literature to explain. It will be appreciated of any insight you may have. Thank you much..