There is usually Mass Thursday evening. While you aren’t obligated to go, I would reccomend you do.
Then, there is another liturgy on Good Friday, with the reverencing of the Cross, the Good Friday Petitions, and distribution of Communion.
Normally, yes, we should try to abstain from servile work for the whole Triduum, but most especially on Good Friday and the hours from 12 to 3
Then, on Holy Saturday, there is no formal liturgy.
Finally, the Easter Vigil occurs, and the great feast of the Church begins.