Raising a seed round

So currently working on a very small scale start-up as a founding engineer (ik), recently got a contact of a seed investor who is also working as CFO in an unicorn, I wanted to reach out to him for seed investment but I'm pretty much unaware of what I should write to him, I'm more into technical side of the company. Should I talk business numbers and the scale at which we are operating and the sales? Or what exactly should I propose him?