My paternal grandparents were from Spain. I would like to get the Spanish citizenship. Please advise me where I can go. I have their birth certificates, baptismal and my father's.

If nothing has changed if you grandchild you can opt for the citizenship check the consulate website or get an appointment via email

I agree, check the website. With Covid restrictions an appointment is probably necessary. Also the website will point you to all the paperwork you need and if anything needs to be translated, notarized, or paid by money order.