So my first question would be why are you starting a server? Is just for money or are you trying to actually make a decent Woi server where people can play and enjoy the game? I'm honestly not trying to be negative here, but long time players have seen lots of people start servers trying to get as much money off them as they can, then shut down the servers without any notice whatsoever. Most people would be glad to have a well run server to play on.
As for ideas, this is only my opinion, but I have never seen any zen system work without having people abuse it and having an unfair advantage, so maybe you can go with a free zen market, and have other things available as donation items? Things like Deicide Crystals, Zeus Wings, Oracle Mail, pets like Aphrodite, Dark Venus and Apollo? I mean I'm sure people would pay for those things to get them, but regular players that can't donate also have the chance to get them in game as well so it wouldn't be totally unbalanced, donators would just get them quicker and can help fund the server as well. There's a lot of people, like myself lol, that sometimes feel that servers become totally unbalanced when only donators can get certain things, or just have a huge advantage with zen that regular players just can't keep up with. This way, people can pay for those things to get them quicker, but everyone still can get them over time. And people that want to donate to the server to support can do that as well, what do you think?
As for ideas, this is only my opinion, but I have never seen any zen system work without having people abuse it and having an unfair advantage, so maybe you can go with a free zen market, and have other things available as donation items? Things like Deicide Crystals, Zeus Wings, Oracle Mail, pets like Aphrodite, Dark Venus and Apollo? I mean I'm sure people would pay for those things to get them, but regular players that can't donate also have the chance to get them in game as well so it wouldn't be totally unbalanced, donators would just get them quicker and can help fund the server as well. There's a lot of people, like myself lol, that sometimes feel that servers become totally unbalanced when only donators can get certain things, or just have a huge advantage with zen that regular players just can't keep up with. This way, people can pay for those things to get them quicker, but everyone still can get them over time. And people that want to donate to the server to support can do that as well, what do you think?