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Well just as there was the Sabbath, early Christians would gather together. They would have fellowship and the Holy Spirit was with them. Peter had stood up and preached sermons. And in Acts 2:42, "And they continued steadfastly in the apostlesβ doctrine and fellowship, in the breaking of bread, and in prayers." They showed love and compassion for others and especially those in need. As they grew also Paul began to minister to churches in different areas and guide them as well to be led in the spirit.
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You might like the Didache, written in Egypt or Syria in the 2nd century. It goes over several of the Ten Commandments, lists various sins, talks about baptizing in the name of the Trinity, instructs people to fast on Wednesdays and Fridays, says to pray the Lord's prayer and take the Eucharist seriously, etc. It's not a long read at all! Full text here.