Football hall for children

Greetings,
I am a coach in football club FC AJAX TALLINN. Our club is one of the oldest in the country and has a very rich story behind it. We also don't have any sponsors nor investors.

In summer, our younger players are training outside, on our stadium but we do not have an indoor sports hall to let them train on in winter, but we would love to have an opportunity to build one.
Thank you very much for your help.