The whole thing is ridiculous. If you are not a developer there isnt a circumstance where a development team builds your own solution for free. Your one of a billion people with a plan, another "game designer" without any skils.
You have to offer some value to get a community of people to provide you value for free. Your plan is incredibly vague and doesnt really sell anything. Why should anyone spend the man hours implanting another image board so that you who apparantly has never hosted or moderated anything can do so. What is so special about your vision ? At least describe it.
Futher, your obessing with the wrong details. Who cares what language its written in - thats transparent to the user.
You should promptly:
1 - record and discuss a detailed vision not centred around how you want your own board
2 - Promptly adopt an existing imageboard and host
3 - Begin learning gow to customize aesthetic
You may discover that:
1 - You dont have a vision at all and you just want to be in charge
2 - You actually dont want to host a imageboard - its not profitable or thankful work. Moderating will suck and each moderation decision will bring hate. But people probably wont use your board anyway.
3 - The customization / aesthetic isbt as important as you thought and you'd rather not know the internals.
Alternatively, you may gain valuble experience and this could change your life even if only gwtting you into webdev or it.
Either way, god speed anon.