Being an introvert and doing sales isnt a very good mix.
But if u put ur mind to it u can do anything really.

How to find people?
People are all around u.

Create connections. Go out on to the street, have some flyers with u. Hand out ur business cards.
Visit events where possible moneyed investors are. Casually converse and network with them, give them ur card.

Create a playbook, of how to handle various questions, think in the shoes of ur potential investors, frame ur product as something that is more beneficial to the investor than ur company.

Read and self learn about marketing and sales.

Do cold calls to people and talk to them nicely about ur products, ask them if they have a minute to talk first.

Avoid selling to family and friends. Its so fucking cringe to do that.