does anyone know the translation in latin (not spanish) of "Main Course" & "Side Dishes"?

Answer 1

Romans called their course by their order and did not have an equvalent word/term for 'main course'.

Cena prima - first course
Cena altera - second course
Cena tertia - third course.

Cena used alone is any course or the complete evening meal.

You could use 'cena praecipua', which is a literal translation of 'main course'.

'Side dish' also does not seem to have been used. Roman practice was to just name what was in the dish. Again, you could use a literal translation - cena parva (small course).

Answer 2

main course -- cena

side dishes -- adiaceo epulae