It appears you have a good case to file for an emergency custody, assuming that the other parent is not available to care for the child(ren).

Yes, anyone who is not a party that is over the age of 18 can serve papers on someone else.

Go to the office of child support enforcement agency located in the county you live in they can help you.

without the other party's consent or court order if you were to move, he could try to force you back (assuming he filed something immediately after...

Unless you can prove the grandmother is unfit and/or there are exceptional circumstances that warrants you having some type of access schedule...

You need to prove that there has been a material change of circumstances that is detrimental to the child that in turn warrants a modification of...

If the other parent files a modification, the court can take the new income into account when determining whether or not to modify child support.

a retainer agreement (even if it is a limited representation) is strongly suggested when having an attorney do any work for a party to a court case.

Assuming that the court order provides standard language that the obligor (you) needs to provide the court with any updates of address and/or...

You should sit down with an attorney to learn about all your rights and options but short term and long term and the pros and cons of each.