Dear @crypto.piotr, 

I am not sure whether I have shared the below link with you before. It is a very useful resource for those intending to go the STO route. 
https://token.security/stn/

Here is another link which could shed light on STOs. 
https://www.securitytokenacademy.com/

As you browse through these you will realize the complexity of the issues involved and the importance of getting advice of professionals from across many disciplines.