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I will say up front that that is not going to teach you a whole lot and you should not put any of them on your reel because sound folks can have a negative reaction to that and they know it wasn't done under "real" conditions.
That said I would probably go to the Internet Archive and download a B film from the 40's or so. There will not be a lot of FX and few on the dialog so you should be able to get pretty clean dialog.
A better learning experience is to apprentice to someone locally who know what they are doing. You will do a lot of "crap work" but you will also learn a lot about how things get put together. Non union houses will often be very open to free labor, and you might end up with some paying work out of it.