Car wont start by ignition, have to start with wire , now when i start it it keep trying to turn over , JUst help

Lately i ahve been haveing to jump the car with a with touching some part of
the starter ( and it starts) Can't get it to start by the key , then yesterday
when i was starting my car . i got it started but even after it was started it
kept trying to turn over and over . ( THis contiued long after i took the key out
of the ignition. Before i got to the battery to disconnect it, there was slight
smoke coming from the starter. Anything would help me out . I have the
money just need to know what i need to purchase ( Replaced the starter not
even a year ago, and it drove fine for the longest time. So i cant see that
being the problem.