My grandmother was born in France but I don't know where in France.
Also my grandpa was born in Spain but I don't know where in Spain
How do I go about locating them. I just have 35 year old paper saying this but no one knows much
There are several answers to your query. We will point you in a direction but do not have the staff to do the research. That we leave to you.
To make your searches in FamilySearch Search more productive here are some hints to improve your searching. Click on Help (circle with ?) and enter the keyword "tip" and then follow the suggestions in "What are best practices and tips for searching Historical Records?" Please understand that when following the Search -- Records link that you are searching only the records that have been indexed and that consists of about 35% of the records we hold.
For the rest of the records which have not yet been indexed go to Search – Images. This list is constantly increasing because we have 300 teams who are around the world digitizing records and they upload those images nightly. They are minimally identified and have waypoints added then are made available to search at Search Images. We recommend that you again click Help and enter "Search Images" and follow the hints in "Tips for searching Historical Images?"
For other research tips and practices concerning the place you are searching we recommend the Research Wiki. Please click on Search -- Research Wiki and start with the larger place. There are many research techniques discussed on this page.
If you are up against a brick wall, we would suggest going to the Wiki and enter "Virtual Genealogy Consultations" for a 20-minute appointment with a research specialist who will analyze your research to date and make suggestions for further research. To make the most of this appointment please review and follow the instructions found in the Important Information paragraph.
We hope that these instructions help move you along your research pathway.