Noob hosting with DB and Email?

Sorry if this question is too basic, but hoping you guys can help. I am a brand new web developer (as in I don't know what the hell I am doing, but I'm making a very simple site by Mr. Magooing it).

I don't know anything about hosting, but on my local machine I've built a site that uses HTML, CSS, Javascript, Node.js / Express, and a PostgreSQL DB.

I don't want to rewrite any code to use something like Supabase for auth (I've already built that logic in express). I'm looking for a very low cost place that can host my app, including a DB, and hopefully help me have emails? I haven't explored email yet but I will eventually want to.

I will be buying a domain once I am ready. It's basically going to be a small family project. I don't expect it to ever take off, and so I don't need anything too powerful. I expect 15-20 users all time, and probably never will have more than 1 concurrently.

I will someday want to make an iOS app to sit in front of it.. but that is probably a ways away.

Any direction or help is appreciated! Thanks all!