In which order i am to complete these prophecies(Hortator and Nerevarine)? I heard that i would have to become Hortator first. But I think i can become Nerevarine first, or it doesn't matter. What is true? Thanks for all help

Doesn't matter, if I remember right. You don't even have to do all of either branch at once before doing the other, you can get the support of each group in any order that's convenient.

Peregrine is indeed correct; there is no required order, but being Nerevarine supposedly influences the Horator quests, most likely through simple disposition changes.

Most people tell you to do the Nerevarine quests first, before moving on to the Hortator quests, and people usually say that it gives you experience for the Hortator quests, but those are completely different.

And I think the only thing the Nerevarine quests influence on the Hortator quests is that Redoran hates you even more, unless you're part of that House.

So you are suggesting me to do Hortator first, but finishing game doesn't depend on it, right?

Play as you wish. Whatever action you take will make you that much closer to the endgame of the main quest. As for me, I was just informing you, and whoever else decides to read this, what people normally do.