Court ordered house to be sold and profit split 50/50 when youngest graduates high school. ( next year)

You need to start discussing this with her now. If not you may seek judicial intervention.

Do I have a case for court?

If your NC order expired at 18, then it is expired. You would be trying to modify your NC order.

You would have to speak to an attorney in FL where you got married to see if there are any possible causes of action.

How long can it take for a court to make a decision on legal custody ?

Unfortunatly, Court is not the place if you want a "quick answer".

Can my lawyer advise me where to register my kids for school?

I'm not sure what your question is. Can your attorney give you practical advice, sure. However you are restricted where to send your child to...

If the father signed the birth certificate but has been absent in the child’s life, can the mother file and get sole custody?

She can try. The law of unintended consequences is that once she files dad will work his way back into the kids life. Please speak to an attorney...

My girlfriend just gave birth, but her children from other relationships have been taken away for other reasons.i want my child?

You really need to be speaking to an attorney asap to discuss your precarious situation.

How do I get more time and over night visitation with my son?

I strongly suggest you speak to your attorney or another attorney to develop a plan of how to petition the court for more time.

Before you think about moving I strongly suggest you consult with your attorney to review your circumstances and see what steps you may need to...

There is no way to give an answer. Every case is different and it’s hard to predict the unknowns.