Gentile question: what to expect in a minyan in the days after a funeral. And a few others. Apologies if I worded it incorrectly.

Hi. First I really want to thank everyone for their advice about attending the funeral. Your advice was incredibly helpful. The service was absolutely beautiful. There’s a minyan tonight and I was invited to attend by the family.

I’m going to stay quiet for the most part, I don’t want to bother them, but I feel incredibly grateful for this opportunity. It’s been hitting me much harder than I realized this would, and I’m touched they’re allowing me to celebrate his life and grieve with them.

So couple questions:

1. What should I expect at the minyan?
2. As a non jew, I’ve been praying for my friend’s father to “get to where he needs to go.” I don’t want to offend anyone but if there’s something else I can pray for for him, I’d love to know. I didn’t want to get it wrong.
3. The man was a wonderful human, if you’re willing to say a prayer, would you?

Thank you so much.