Blastoffering - don't quit law school, don't invest, don't get a cofounder. Your only job right now is to validate your idea.
You believe in it - that's dangerous. You could be wrong. Building it and then discovering that is ludicrous. Imagine you dropped out of school, convinced your parents to invest 300k, convinced a coder to quit his job at google and lose $x00k of options, only to discover after building it that nobody gives a shit!. Instead, try to validate your idea in the cheapest way you possibly can.
Your inspiration should be Arram Sabeti, CEO and founder of ZeroCater. The dude had 500 customers before they wrote any code. He scaled it up to 500k ARR while running it off a spreadsheet!
There's this pervasive myth that once you get an idea you need to go find a technical cofounder. Bullshit. The last thing you want to do when you have an idea is code. You need to validate the idea as cheaply as possible.
Code isn't cheap for you. That advice about just building it - that's for engineers, where a few years ago building something was a cheap way to validate. Today, for you, it'll be cheaper to buy ads, pre-sell it to potential customers, or even do the cliche talking-to-strangers-in-a-starbucks things. All of those options are better than writing code at this stage.
Email me, I'll set you straight and help you turn the idea into practical steps which will allow you validate the idea without writing any code: paul.biggar@gmail.com.