1. You should appeal before the High Court immediately not later than 90 days.
2. It depends on how persuasive your Advocate is. It might be listed for hearing with in 15 days.
3. When your husband has been declared as the Natural Guardian of your son (it is very strange), he is expected to call the shots and decide about the vital matters of your son's life including education.
4. The said custody direction is strange. When permanent custody has already been decided by the Court the concerned case will be treated as disposed of. Challenge the said order before the High court.
5. No order is automatically stayed on being challenged. You shall have to obtain stay order by filing an application to that effect.
6. You can challenge the order passed by the lower court in connection with the permanent custody of your son and if you can convince the High Court, it will end the matter back to the Court lower directing it to rehear the matter.
7. You shall have to a note on your Vakalatnama issued in favour of the new Advocate, by your earlier Advocate metioning 'No-Objection' thereupon.