I have occasionally heard a reader saying the intoductory note printed in red in the Missal before each reading, and consider this is a thoroughly bad idea.GIRM 31. Likewise it is also for the Priest, in the exercise of his office of presiding over the gathered assembly, to offer certain explanations that are foreseen in the rite itself. ... He is permitted, furthermore, in a very few words, to give the faithful an introduction ... to the Liturgy of the Word (before the readings)
GIL 42: The president is responsible for preparing the faithful for the liturgy of the word on occasion by means of introductions before the readings. (GIRM 31) These comments can help the assembled congregation toward a better hearing of the word of God, because they stir up an attitude of faith and good will. He may also carry out this responsibility through others, a deacon, for example, or a commentator. (GIRM 105b)
Those websites are Catholic Book Publishing
Liturgical Training Publications
Magnificat (for the U.S.)
Universalis
GIRM 105 b. The commentator, who, if appropriate, provides the faithful briefly with explanations... In performing this function the commentator stands in a suitable place within sight of the faithful, but not at the ambo.
The Dutch bishops have published a wonderful resource for every Mass (Sundays, Solemnities, Feasts and daily Mass) with brief introductions to the Mass of the day (optional after the Sign of the Cross and Greeting). These allude to the readings of the day and make a connection with the celebration of the Eucharist. But, aside from the language, this may not be what you are looking for.
In seminary, we learned how to make these short introductions to the readings ourselves. They should indeed be very brief, carefully prepared beforehand and lead people into the Liturgy of the Word, bringing the faithful into an attitude of attentive listening.
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