I’ve been having a fellowship, or, Church in the Home, in my home, since 1977. My advice would be to make sure you have these three elements: Solid teaching from the Bible, a time to pray, and, most of all, LOVE.
While there are plenty of other things that you can do, sing, sharing time, etc., my opinion is that if you have those three you will indeed bless people.
Don’t be afraid to teach. You can always teach what you know and what you are learning. And, you can also find some good teachings on line that you could download, but listen to them first – if you believe it is a good solid teaching, then play it for your group.
Prayer time is really good – a time to get quiet and pray; there are many ways you can do this too. Giving people an opportunity to pray about what’s on their heart is a real blessing to a lot of people.
Love – I can’t stress this enough. Whoever comes in your front door, love them; don’t judge them or criticize them, or condemn them – just love them. People change from the inside first, and it’s the goodness of God that leads one to repentance.
I hope that helps – God bless you.
Mike