Try the about page here to get a broad idea of what this community is about. As you will read, a good way to start learning what Harry James Potter-Evans-Verres knows is by reading the sequences. Don't be intimidated by the length; if you've liked HPMOR enough to come here, you'll find at least some, if not all, of the sequences fascinating.

As for asking for help, you may want to make an introductory post on the welcome page. You can give a longer description of yourself and your goals on this thread. Also, if you give more details about yourself, I expect someone with some more specific ideas will be able to help.