Officially, the  Season starts with Ash Wednesday. We receive the ashes and begin fasting and making sacrifices, but it is only on the first Sunday  of Lent, that  we experience the full  flavour of this holy Season, for it is only then that the Church is  using the  Lenten Propers, full of beauty and of useful exhortations.

Here is a sample -two verses of the Lenten Hymn for ad Matutinum.

Flectámus iram vindicem,
Plorémus ante Iudicem,
Clamémus ore supplici,
Dicámus omnes cernui:

Nostris malis offendimus
Tuam, Deus, cleméntiam:
Effúnde nobis désuper,
Remissor, indulgéntiam.

English  translation:

In prayer together let us fall,
And cry for mercy, one and all,
And weep before the Judge’s feet,
And his avenging wrath entreat.

Thy grace have we offended sore,
By sins, O God, which we deplore;
But pour upon us from on high,
O pardoning One, Thy clemency.

See the Breviary notes page for particulars of the  Lenten rubrics

On the Devotions page you will find  the text of the  3 hymns of  Lent in the Divine Office!

May God grant you a grace-filled Lent!