Well, the best advice I can give is to get an attorney.
Contact the state bar
and see if they offer low cost or pro bono services.
Trying to represent yourself in court is almost as bad as trying to perform surgery on yourself...and sometimes even more dangerous.
I would certainly attempt to attend the emergency hearing...but if you are not allowed to attend, you will get the chance at some point in the future (that would be the time to have an attorney)
SO, advice on what to present? The court has one concern...the best interest of the children. Evidence that support this and helps you is what you need to present. The court will be reluctant to prevent access to the kids, but it may limit visitation (custody) if it feels appropriate.
The DV charge is a concern. Evidence you can present to the court that shows that this will not occur again or will not effect the kids is good.
BotXXXXX XXXXXne; find an attorney that can help you present your case.
Please let me know if you have further questions; if so I will do my best to answer them. If not please hit the accept button, its the only way I get credit for my work.