Launch coming up. How do I build a social media presence?

I started an online business about a month ago. The long-term vision is to have it become a social platform. It's a minimal viable product (MVP). We are trying to launch as soon as we can. I believe that before we launch, we first need to create buzz, and creating a social media presence. What is the best way to do so?

I honestly have no idea where to start, and what number would be a good number to have (for followers on Instagram, for example). I assume we should start with instagram and...

Launch coming up. How do I build a social media presence?

from Launch coming up. How do I build a social media presence?