A voice artist records the words. It very often means the same script twice — once in English and once in Spanish — and someone who can do both well is worth finding once and keeping.
Priced per finished minute or per script, and usually including one pickup session for changes. Ask whether the price is for the recording only or for a mixed, delivered file.
Send the script with the pronunciations you care about marked — names, places, your own brand. It costs nothing at the briefing stage and it is the single most common reason a read has to be done again.
You say what you are trying to achieve rather than what to buy. Lucy shapes it into a brief, prices it against what people here actually charge, and shows you the creators who can do it. You agree a figure before anything starts. The money is held until you approve the work, and Lucy takes 15% of the creator’s fee — never a fee from you, and never anything on approved expenses.