Some Good links in general for OSINT:
A sock puppet is an online identify that is not who you actually are. It can be a fake account of a fake identity. The key with a good sock puppet is to not draw any attention to your real self. This means not using the sock puppet with devices that don’t link to your real IP and your personal information.
The accounts should look legitimate. Meaning there should be content and history to the account.
Here are some resources to read up on:
It is important to not have the sock puppet accounts be tied to YOU. This means using burner phones and computers to create the accounts. Don’t do unnecessary search with that account. Use virtual credit cards to buy the phone and sim. Don’t use the burner phone and computer on your home network. Context matters, if your fake person is in Singapore, get a Singapore number etc.