A word of warning. Music should be an experience, not a commodity. If you make a habit of going to concerts and recitals, you will eventually collect some really memorable experiences. Well, it's not a perfect world. Most of us can't get to all the concerts we want, or they aren't doing very interesting pieces, or it costs way too much, or whatever.
Recordings fill the gap.
In the paragraphs below, I offer some advice based on my own experiences as a collector. If you liked one Brahms symphony, try the others. If you liked La traviata, try Macbeth or Nabucco or Otello. And then go on to Puccini or whatever. Let your tastes lead you, not imprison you.