First check things mentioned by capsat. If they are ok,
Then jack up the car and spin both front tires by hand and check If both run smooth. If they don't, you either have bad wheel bearings or jammed brake. Jammed brakes cause disc warp, which cause wobbling.
If tires spin smooth and get hard at some specific points and then get smooth, most probably your brake discs are warped.
Also check free play in wheel hubs and ball joints etc.