I've attended Divine Liturgy at a Serbian church a number of times.
The Liturgy doesn't differ, at all.
People did tend to sit more than at my Ukrainian parish, but, that might just be a local thing.
The Liturgy was sung in Church Slavonic, so, I was able to "understand", although, I would have still been able to follow, if I hand't understood the language.
The sermon was in Serbian, which I didn't understand.
...a tiny bell was rung during the Epiklesis...which we don't do at my church.
Otherwise, all was the same. I felt right at home.
Expect to go visit with the Lord.