Need Help

[killerMs4]

Hi,
    i'm beginner on networking and new using OPNsense. i'm stuck in a problem with OPNsense ... from my logic i think i need to configure the correct rules, here is my work:
 i'm working on implementing a intrusion detection system with a AD DS, dual firewall, DMZ , PROXY , REVERSE PROXY : in attachment my network installation diagram.
right now every things goes well except : the link between my internal OPNsense and my proxy.
my internal firewall act as DHCP server for LAN ( 10.10.10.0/24 ) and a static IP for DMZ ( 192.168.189.120)
and my proxy has two IPs (192.168.189.134 linked with internal firewall), (11.11.11.4 linked with my external firewall).
the main point : how can i make all the packets coming from clients to 10.10.10.1 redirected to my proxy 192.168.189.134 ... i though that may be i need to redirect from 10.10.10.1 to 192.168.189.120 and after from 192.168.189.120 to 192.168.189.134 but when i realized that my clients recognize 192.168.189.120 i got confused ...
Please any help i'm in the last 2 days of my study project.