Noob trying to get Wireguard on vlans, would be nice to know

[RoWAN Tree]

Hi I'm a noob trying this for the first time. I have been trying to get wireguard to work on a diy mini pc for over a month, I pay for internet but don't want to use the router they sent me so I bought the mini PC and installed opnsense.. I bought a TpLink TLSG108E managed switch and that been setup as well, my issue is that I can't connect to wireguard I put all the information in and try the DNS settings but I get lost because I don't understand everything, it locks me out then I have to reinstall and do everything again. Chatgpt sucks because it keeps freezing in the middle of setting up. I am having burnout with this and I haven't even got a working connection to the internet yet.. As a noob please add an update to your documentation tutorials because you update the software but then the tutorials become obselete..  If someone can help me figure this out would be cool. this is my last attempt at trying to solve this before abandoning the idea of having a private network, thanks for anyone's time!