First of all, the three cases of not losing novelty are: 1, which was exhibited for the first time at an international exhibition hosted or recognized by the China government; 2. First published at the designated academic or technical conference; 3. Others disclose their contents without the consent of the applicant. If the above three situations exist, the applicant must indicate and provide relevant materials when filing the application, otherwise the patent application will be affected.
Secondly, regarding priority, it is not necessary to apply for priority in the first domestic application, but according to the Paris Convention, when applying in other countries, it is necessary to indicate the priority of China when submitting the application materials.
Finally, it is strongly recommended to find an agent, otherwise your good idea will be in vain, because it is very likely that your invention will not be best protected because of your mistakes.