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私たち素人が曲を歌って楽しめる店「カラオケ」があるのだから…
→ “We amateurs can enjoy singing songs at a place called 'Karaoke'...”
私たち watashitachi = we (inclusive pronoun)
素人 shiroto = amateur / layman (noun)
素 shi = plain / unpolished
人 jin = person
が ga = (particle) marks subject or focus
曲 kyoku = song / tune (noun)
を o = (particle) marks direct object
歌って utatte = singing / to sing (v. te-form, indicating action or cause)
楽しめる tanoshimeru = can enjoy / able to have fun (v. potential form)
店 mise = store / shop (noun)
「 = (punctuation) opening quotation mark
カラオケ karaoke = karaoke (loanword from English)
」 = (punctuation) closing quotation mark
が ga = (particle) marks subject or contrastive topic
ある aru = exists / there is (v.)
の no = (particle) adds emphasis or explanation
だから dakara = because / therefore (conjunction)
… = (punctuation) ellipsis indicating trailing thought