Many people find it very helpful to prepare for Mass by spending some time reading and reflecting on the readings which will be proclaimed during the Mass.
At present, the readings in the particular translation used in England and Wales are not easily available on the internet for copyright reasons. The Sunday Missal, published by Collins, contains all the readings for Sundays and Holydays, as well as the Order of Mass and some prayers.
Copies of the readings for Mass in a number of languages, including English, are available from the Vienna International Religious Centre.