Pull out the bobbin/bobbincase and check that there aren't a bunch of threads or lint stuck or wrapped around the internal metal parts. Clean the feed dogs too (you'll probably need to remove the metal needleplate).
I'm guessing your machine hasn't been cleaned and oiled for quite a while. It is mechanical and, like your car, it needs frequent lube to keep it running. Check out the following (this method has worked on several seized machines I've picked up as non-working):
Wheel on right side that controls the needle up and down is very tight...
It was working now it seems to be frozen the needle part wont move
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