cubase errors/problems

hiya gang.
recently purchased Cubase elements 10. was just wondering… whether my Cubase needs a midi keyboard controller and production speakers…
am having a tiny of difficulty with halion sonic and prologue. I can so far get drum sounds and piano sounds, and have made a few instrumental tracks. however when trying to select for example cello or bass sounds it doesn’t correspond with my music. it has no music no sounds. that’s all ive got to say. please somebody help
much love. Shelf Lyfe :ugeek: