There is no training contract to speak of. They had one a few years ago, but the never enforced it. Basically they are illegal unless the have you sign a promissory note. I have not seem them do that. I would not worry about it right now. They are really hard pressed to get people.
They sim ride is straight forward. Show that you have a scan and that you improve over the ride and you should not have anything to worry about.
We lost 300 pilots last year and that number is going to go way up this year as many senior pilots here are very well connected at DAL.
Best of luck