Looking to connect with people who are in the early stage of app launch in Canada.

Hey everyone, I’ve built my app and I’m in the early stages of launching it- now I’m stuck on next steps. What should I do? Should I get a trademark for the app? What variety of domain names should I buy?
I’m planning to launch in the USA and Canada. Does anyone know of a lawyer who specializes in edtech startups or app-related legal work?
My app is built for teachers. I’m a teacher myself, and I’ve seen firsthand the daily pain points and the cracks where our hard work slips through unnoticed. I strongly believe in this idea, and I’m looking for people who can guide me- and possibly anyone interested in joining me on this.