Ipsec StrongSwan -- 2

I would like to set up a VPN with IPSEC

I will have 4 users from different locations, they will have to authenticate on an IPSEC server that I would like to be mounted on UBUNTU using StrongSwan


This UBUNTU server will be on VULTR and will authenticate with the company's IPSEC network that is elsewhere using PSK communication


Standards we must follow:

IPSEC UBUNTU Server
- PSK
- SHA2
- AES 256
- Diffie Hellman
- IKIEv2
- Expire: 86400s

Gateway:
- sha1
- AES128
- Tunnel
- PFS: off
- expire: 3600s

I need a tutorial to be made so that I can reproduce this environment in my VM UBUNTU IPSEC SERVER
And so that I can authenticate the VPN for users who are outside the network.