zeroline will work with Interactive Brokers so you will need to open an account with Interactive brokers first.
You can then use zeroline trader to connect through interactive brokers and start doing simulation trading.
Each point that the YM goes down, it's multiplied by 5. Here's the list of multipliers for every point (not tick):
1) YM = $5.00
2) NQ = $20.00
3) ES = $50.00
4) ER2 = $100
While these are futures, every point drop on the DOW doesn't necessarily mean a one point drop on the YM although they follow each other pretty close so you should assume that for simplicity's sake.