Beethovens 9th certainly isn't the best starter for getting into vocal music! But if you liked it I suggest you go to Brahms EIN DEUTSCHES REQUIEM next. Try the Robert Shaw recording. Then try the Passions by Bach: St. Matthew with Ennoch Guttenberg, St. John with Suzuki, B minor Mass with Thomas Hengelbrock. Please contact me if you need further advice.
Best of luck!
Best of luck!