About online the server

quick question if its possible to online your server using your own computer even if you dont have a dedicated server or vps?

yes sir using hamachi but limited players only i think theres a tutorial on youtube how to set it up

You can, ignore what Rapid0 said. You don't need hamachi and there is no limit for players.

yes sir in no-ip right?

PORTFORWARD

Sure you can, you created own server? try google "Make Flyff server online". Almoost everyone can make it work

There are some ways.
1. Hamachi ( For each 'Network' 4 People can Join (or buy Premium)
2. Setup your IP to an PermIP that doesnt change every 24h.. and Setup the Ports on your Fritzbox or what ever you got...
3. Use NOIP, dyndns or what ever Else...

Btw. The cost's to Run your PC 24/7 are higher than 15€ per Month i think so you better buy a Starter vps for 15€... 8gb RAM 300gb HDD + DDoS Protection.... i dont think you got a 100mbits++ Connection for a good Download and laagfree Gameplay and i dont think you can stand a DDoS attack on your Computer xD

Home Hosting :
- 8GB RAM (Windows 8/10 need more RAM than a Root.)
- 500GB HDD (Windows 8/10 got more Updates + Graka Hardware...)
- DDoS Protection ! - Cloudflare i think? (I dont know Currently the Prices but i think 40€ +/- ...)
- More Cost's for 24/7 Hosting 15€ +/- ...)

In my opinion Home Hosting isnt a good idea.