International marriage and validation in home country

Hello.

I am Irani citizen temporarily residing in Sweden while doing my masters, and I am willing to get married to a Palestinian girl holding the Swedish nationality.

By the end of this year, we are planning to move to Iran for a while before my papers are sorted and we move back to Sweden.

What papers do we need to validate our marriage in Iran, and how to fix her residency when we come as we might stay for more than one year there?