Via social media groups? But people will consider the project as scam even though if you have some reason to go with that way.So you have to built a website with better security system and for that you can hire better professional.
Most probably a scam because a project without a team is purely greed and no plan at all. Creating your own website is good but if you’re not good enough on that I suggest to talk with a team, plan with a team and release the project with a team. Private sale usually partnered with a bigger investors, they will look for more genuine project for sure and if you’re not good enough, you’ll not be on the list.