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I think the threefold path is quite a useful model. So
BUT
Practically membership of some kind of sangha. Maybe contraversial but without this I think it is difficult to maintain a practice. The other things would then flow from this.
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Yes, it is the five precepts on normal days and 8 precepts on Poya days. Apart from that, do meditation and good deeds whenever there's an opportunity. Or simply come up with plans to avail opportunities to do good deeds. Just like how we normally plan or devise ways to gain sensual pleasures.
Upvote:2
It depends on the tradition. Theravada, Mahayana, Vajrayana and their myriad "flavors" recommend different practices for laypeople.
As a general rule, Crab Bucket's answer seems like a good place to start, including the part about joining a sangha of some kind.
The Pali Canon also includes the Sigalovada Sutta, where the Buddha gives some practical (though not geared towards reaching enlightenment) advice on how to lead a householder's life.