Sailing / Cruising courses, where to start??

I've been sailing most of life but only on small boats and on local waters. Last summer I bought my first sailboat a Contessa 26. While I know how to sail and managed to sail/motor my Contessa from Toronto to Orient Point, Long Island, there are many things I don't know.

I would like to learn about coastal navigation, proper use of the radio, radar, sail trim, and safety procedures, anchoring, etc.

I'm planning on taking my boat up to Maine next summer but at this point I don't feel comfortable enough with my skill set to do so.

I'd like to find a sailing school in NYC that offers a series of classes and/or certifications.

I've looked into Power Squadron classes which seem affordable compared to the local sailing schools. However I've read a lot about ASA courses as well.
I plan on taking a hands on cruising course in the spring but would like to take advantage of the winter months as well.

Any recommendations would be greatly appreciated.

Thanks!