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Depending on which version of Windows Moview Maker you have it shouldn't be too tricky. I have no idea why you're exporting a .WMWAM file, more likely that you're exporting a .WMV (Windows Media Video) file.
If you're importing a .MPG to edit in windows movie maker there are special effects you can add to it but still, the programs quite restrictive. When you are done editing, there should be a Save/Save As... (or possibly publish). You should have the option to export to a .AVI (HQ) or .WMV and there are a number of options for wuality, but if you're uploading it to view online keep the file size as small as possible whilst retaining a decent amount of quality.
Looks like a bit of trial and error may be required ^^
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