If anything, there are fewer things to do in an Orthodox wedding than others.
Order of service? Check.
But there are a couple of concerns that we found. First of all, you need to find out if your parish has wedding crowns, a common cup, and candles for you to use or if you need to buy your own. Some parishes want you to use theirs, and others (like ours) have them available but are open to your using your own.
Also, you need to be aware of any dress code the parish may have (talking about the ladies here; I expect the men will be wearing a tux). Some parishes are very particular about neckline, strap width, etc. Your fiancée may also have to wear a shawl and/or head covering. Dress code varies widely by parish and may be different from an ordinary liturgy (you will be in the spotlight, after all). It's something to ask your priest.
Also also, be sure to bring the icons (typically Christ, Theotokos, and Wedding at Cana) and rings to be blessed. They should be present at a Liturgy before the wedding. Your priest may keep them or may ask you to keep them at home, especially if they are valuable.
That's about all I can think of now. Hope that helps.