Can I do property management without a certificate? I have no experience in property management either. I'm just a novice.

It is impossible to engage in property management without a license according to regulations. In your case, I think it's best to work and study at the grassroots level, take part in the training organized by the Construction Bureau, and pass the exam to get the certificate. The key is to learn professional knowledge and accumulate experience in property management, otherwise you can't do property management with a certificate, because there are too many problems involving all aspects.