N00b question about Avisynth+

[drzapp]

I think I have everything installed correctly. (This page was a big help). I've written a couple scripts and can view the results of the script in avsPmod, can save these scripts as .avs files and have Media Player Classic play it back. But how do I run the script so that instead of just playing the video, it applies filters and saves it to a new file? For example, I have an AVI file that I want to deinterlace and save in a web-friendly format- how do I specifically do this, step by step?
Thanks

Here is my simple script-

 SetFilterMTMode ("QTGMC", 2)
    FFMPEGSource2("X:\Tukaufu\GVL.avi", atrack=1)
    ConvertToYV12()
    AssumeBFF()
    QTGMC(preset="Slower", EdiThreads=3)
    BilinearResize(720,540)
    Prefetch(5)
    Crop(12,0,-8,-8)

[drzapp]

A follow-up question- I have a tape of a TV broadcast on a CRT TV that was recorded by a camcorder. You can imagine... there are all sorts of horizontal lines and noise. Is this even possible to clean up?