Wheel locking up

I just bought a 1999 Plymouth Breeze 2.4L with 110,000 miles, when I test drove the car it ran fine, then after I got home and went to leave again, I backed out then when I went to pull forward the right front wheel locked up and the car stopped. I backed up and it backed up fine but then when I went to go forward again it went for about 4 seconds and locked up again. It did this about 4 or 5 times. Finally it stopped doing it and I was able to drive to another city without anymore problems. Then after it sat and I went to leave again, it did the same thing twice. It doesn't pull when driving, I don't really hear anything, but I have noticed that twice when driving, the car will start vibrating as if the wheel is shaking. Also I noticed the tire is wearing on the outside edge to the point it has a rubber flash along the edge. Please help, I'm taking it back in the morning to see about getting it fixed. I need to know that they are fixing the problem.