There are all sorts of books out there that offer an introductory explanation.
Everything said so far seems fine. I’ll just add that some non-Catholics see the Mass as a mish-mash of prayers, and it makes no sense to them. But nothing could be further from the truth–there is a logical sequence from beginning to end. Some of that has been lost in going to the English Mass (my opinion…), for example in Latin it used to begin “I will go to the altar of God.” response: “To God who gave joy to my youth…” I always thought that was a great way to start, and it’s gone. However, you say the Confiteor (“I confess to Almight God…” and then the Kyrie (Lord have mercy…) and then the Gloria (Glory to God in the highest…) then to the offertory (offer gifts $, food, etc.) then the readings from the Old Testament, Epistles, and New Testament, then the Creed. Hopefully you can see some sort of logical progression here.
Then there are a few prayers before the Consecration, a few prayers after, the Our Father, the “Lord, I am not worthy…”, the “Lamb of God…” and then communion. A few prayers after communion, and that’s it.
But if you pay attention to the prayers and ask yourself, “What is this prayer preparing me for?” it will make sense.