You don't specify Secondary School, but your AP tag seems to imply that as your main interest. I'll start with that, but give a more general answer.
There are some organizations that hold regular conferences and to which you should belong in any case. The conferences normally have workshops in which experienced educators teach some tools-of-the-trade.
The first, focused on Secondary School, is Computer Science Teachers Association. They have both a newsletter and a national conference.
The next, focused on AP itself is AP Teacher Community which has a useful set of discussion boards. They have events (and tutorials) in conjunction with the SIGCSE national conference.
The SIGCSE organization within ACM is somewhat more dedicated to post secondary education. It has several conferences every year, including some outside the US, usually Europe. Many secondary teachers belong and there is support here for such teachers.
The Consortium for Computing in Small Colleges, while focused on college teaching has many annual conferences spread around the US. Like the others here, the conferences often have workshops given by educators. Many topics are covered.
Welcome to CS Teaching. Explore the above organizations for their offerings and subscribe, if appropriate, to their newsletters. You will get a lot of information, and a forum for asking for help.