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If your videocamera records in interlaced mode (as most of them do -- only a few expensive ones give you the choice of a progressive or "frame" mode with no interlaced fields) then your video simply IS interlaced and that's how it stays when you capture it. It's actually a good thing that it's interlaced -IF- you're going to show your final results on a TV screen, not a computer monitor. TVs (except for expensive new progressive-scan TVs) still use interlaced video signals, so the TV actually uses the interlacing correctly and makes the action look smooth instead of jagged. But computer screens display a whole frame at a time, not interlaced. So if you're going to play back your final video results on a computer instead of a TV, you need to de-interlace.
Premiere has a couple of options for de-interlacing. It doesn't do the greatest job but it works reasonably well. The simplest way to do it is: when you're ready to output your finished version, go to File > Export Timeline > Movie, then when the Export Settings box pops up go to the Special Processing page, click "modify", then on the modify page check the "Deinterlace" box. (also a good place to adjust the gamma if necessary, and it gives you a preview window so you can see the results). Oh, and on the "keyframe and rendering" page of the Export Settings window, you want to set "No Fields" if you're going to be viewing your final product on a computer, and "lower field first" if you're outputting for TV viewing.
That process does a reasonable job of deinterlacing but much better ways are available if you study up. One of the best is to output your video interlaced like you did before, then run it through a free program called VirtualDub (easy to find and download online) and use its "smart deinterlace" filter, which works really really well. VDub also has a lot of other great filters that can clean up your video and improve the color balance, brigtness and contrast, and they're somewhat faster in most cases than Premiere's processing. Check it out.
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