Here's a fast way to make your clean footage look more like old 70's 8mm footage.
01) Follow the simple vignette tutorial here.
02) In your Effects Bin find "Channel Blur" in Video Filters > Channel and drop that onto your clip.
03) In Channel Blur's settings try starting off with Alpha, Red & Green all set to 1.
04) Set Blue to 100.
This is a good starting point but feel free to play around with the settings until you get a look you like. Don't forget that if you get things too messed up just tap the Red X button in the filter's settings panel to reset it all to the defaults.
If you have a filmlook plug-in like CGM's Aged Film LE, you can add that now to further degrade the footage ;) Or you can try multiple filters like:
Video Filters > Video > Blink
Video FIlters > Stylize > Add Noise