Hm… Ro as in Ross…? The rest is the correct pronunciation, yes.

Maybe, I don’t know… an as in anvil and te as in tenant…? English, being several unrelated languages in a trenchcoat, can be a bit weird, and pronunciation varies excessively with dialects…

The vowels in Castilian (aka Spanish outside of Spain and other Castilian speaking countries) are very simple, five vowels, five sounds, pronounced more or less as they would have been in Latin.

C is pronounced like a k or a hard z, never as an s (except in some dialects).

Rocinante. From rocín and antes, for he was a rocín (old horse) before being Quijote’s steed (also during, but the old man wasn’t all there).