What was the first estate in revolution

I assume u mean the French Revolution? the 1st Estate was the clergy / religious folk. they didn't have to pay the annual tax.
2nd Estate was the nobles
3rd Estate was the peasants and pretty much everyone else not a noble or a clergy.

Assemblies do not have written codes of laws. laws are matters for magistrates and courts, not assemblies. codes of law are things such as civil law, criminal law, and constitutional law. what assemblies have are procedures regarding debating, voting and other business they might carry out.  also note that rome had three assemblies: the assembly of the soldiers, the assembly of the tribes, and the plebeian councils.