I'm working in a map but I realized it would be a giant effort to make it from 0, so I wanted to know if anyone had a base map or something like that who could share it with me...

No :p

http://commons.wikimedia.org/wiki/Category:SVG_maps_of_Europe

I would still recommend drawing it from start. These maps were made to be precise and not warlight maps. The time you would waste correcting, deleting, modifying is the same time it would take you to make it from start. Only then you can control the size of territories, islands, ect. and it always looks better.

Thanks! I'll see if there's any other good map