2001 Chevy Cavalier 5 speed manual... goes into gear but won't move

I just recently bought the car and its a nice car. I drove it for two weeks
then one day the clutch pedal began sticking to the floor. you would let off
of it a bit and it would stick for a bit then pop up. the same day I caught a
whiff of a burning smell and looked up to see some smoke coming from
under the hood on the drivers side. I made it to work and parked the car
and everything seemed to be normal. Later that night I went to leave for
home and with the clutch fully released and the gas pedal to the floor I
barely reached 15mph. then I shifted into 2nd like normal and attempted to
go up a hill. at that point the motor was going and the gas pedal was
floored and it was in gear but it was rolling backwards... Not sure if its the
clutch or tranny or a combination of both. Did have trouble since day one
with getting the car to go into first gear...