And although my friend and I want to start a Minecraft project like Trymacs, we wanted to ask how we can do that and whether the money costs
Do you already know aternos?
No
If you want to start a sensible project, you need a decent server (preferably a separate vServer), which of course costs some money. In addition, you probably also need a programmer who writes a few plugins for you.
You need a Mineraft server for this - the cheapest professional you get at:
https://minehub.de/minecraft-server-mieten/
https://mine-hoster.de/
https://noez.de/minecraft-server
Or you rent a free, just you must always be aware that it also costs the provider money and well, most providers do not offer the server 24/7 - say, if, for example, 10 minutes no one is on the server, then he goes offline, and you have to start it again via the web interface:
The most well-known are:
Aternos.org (Did that make a video:
)
Ploudos.de
Server.pro
If the server should be online all the time (24/7), then you have to extend it every day, otherwise it will be deleted - Abieter for example Währe Minehub.