Generally, you can convert in a temple, and the specific time varies from temple to temple. Some are the first day and fifteenth day, and some are Buddhist festivals. I converted to Fayuan Temple in Beijing, where the conversion ceremony is held on the last Saturday of every month. You can go to the temple and ask the master when you can convert. You may need to register in advance. Generally, two one-inch (some two-inch) bareheaded photos and the cost of obtaining the conversion certificate should be prepared.
After conversion, if you can achieve the five commandments, you will also hold a ceremony to be ordained. After that, the conversion card will be stamped with the seal of the Five Commandments. According to your own specific situation, if you can't do the five commandments for the time being, don't accept them. It is not good to break the precepts after accepting them.