The Home Ecclesia experience:

My experience with home gatherings is as follows:

Follow the Lord's lead in sizing small/home groups:
12 and no more, this is the most an average size home can accept for two hours per Sabbath.

Christians by invite:
Home ecclesia ('summoned group')  should be a  safe place,  a sanctuary where Christ followers can share their thoughts, cares, hopes with others of like minded persuasion. The bible also warns about the group becoming tainted with the leaven of unbelief  (btw, it also describes how to handle unbelief in the 'body of believers'). The open door welcome to 'whosoever will' is a common situation with today's churches. Outreach/evangelism is best done during the other 6 days of the week while interacting with your community. 'Go into all the world and share the Good News!' Then after becoming 'born again' along with some basic understanding of their new faith, bring them into a Home Ecclesia.

Home Ecclesia services:
Respectfully enter and quietly sit down and bring your thoughts in line with worship. It is a quiet time before the start of service.
Seek spiritual  fellowship  not  entertainment.
Opening Prayer by an Elder or perhaps the homeowner.  (5 min.)
Singing , acapella most commonly.  (10 min.)

Prayer time.
One at a time. (2 min. ea. x 12 = 24 min.) Praise, worship, spiritual kingdom building, Holy Spirit's leading. Thanksgiving.

Testimony and scripture reading.
Voluntarily (without pressure) stand and and speak what's on your heart. (Be supportive of one another) Watch the time as above, with prayer time.

Communion.
Take communion to remember Yahshua (Jesus) suffering for our sins. The bread represents his body, the wine recalls his blood that was a final sin offering, poured out in our favor. A prayer of  thanksgiving would be  nice. (10 min.)

Prayer Requests.
Bearing one another's burdens together. Petitioning the Father for our pressing needs. Careful about gossip outside the gathering. (10 min.)

Personal bible reading goals.
Share with the gathered what bible verses you plan on reading this upcoming week. Goals made known are more likely to be reached. (10 min.)

Outreach goals.
This is where evangelism comes in. (10 min.)

Closing Prayer.  (5 min.)