I contacted my ISP and requested a IPV6 range, back i got this information:
2001:2c1:f2a2::1/64
PE = 2001:2c1:f2a2::1
When i ping from a remote location, i get answers from 2001:2c1:f2a2::1 before having anything setup, so i guess the ISP has the ip configured as GW already, how do i proceed to get the range setup with dhcp-server and ND on my mikrotik.
You don’t want this. It assumes that you will either connect devices directly to ISP’s router (without yours), or that your router would need ND proxy, which RouterOS doesn’t have. And even if it did, it’s still not good. If there’s a chance they will listen, try to ask them for proper routed subnet, i.e. one that they would not have on their router, but it would be all yours. And ideally it should be larger one, because /64 is good only for one network segment, so if you wanted e.g. separate network for guests, it’s not enough for that.