Soliciting contact with minors on the Internet is a huge red flag.

I suggest you delete this thread.

Can you not see how posting a message online saying "I'm looking for kids...I don't know, between 6 and 12 years old" sounds seriously alarming and creepy?

Your actions are against italki rules, and could have you investigated by the police. 

4. Eligibility

The Site, Application and Services are intended solely for persons who are 18 or older. Any access to or use of the Site, Application or Services by anyone under 18 is expressly prohibited. By accessing or using the Site, Application or Services you represent and warrant that you are 18 or older.

For users in the United States, italki may, to the extent permitted by applicable laws and if we have sufficient information to identify a user, obtain reports from public records of criminal convictions or sex offender registrations of the user. For users outside the United States, we may, to the extent permitted by applicable laws and if we have sufficient information to identify a user, obtain the local version of background or registered sex offender checks in our sole discretion. You agree and authorize us to use your personal information, such as your full name and date of birth, to obtain such reports, including from italki's vendors.