Hello j.tycherne! Happy to see someone who loves the letter to Menoceus as much as i do, and you're right to love the parts rejecting belief in fate, a belief which does nothing but inflict pessimism and misery on the hearts of mankind. I do my best to read it and the Vatican Sayings as much as possible, constantly filling me with joy. Of all the shorter works of Epicureanism these are my favorite.
And please don't apologize for any ignorance, we all start ignorant but what matters is aspiring toward wisdom, and you're already on the right track, as Seneca quotes Epicurus "The knowledge of sin is the beginning of salvation!"
Happy to have you!