I am agnostic/atheist trying to pray 3 times a day. What is a prayer?

Hello I have many catholic friends, I am too afraid to ask them for help so here I am.
I want to start praying 3 times a day, I have memorized the Out Father and Hail Mary prayer.

What counts as a good praying session? Do I just say Our Father one time and thats it? What else do I say?