GMB concern

Care of gmb veryfication, do they check if business real, or you can submit fake business name, just a keyword? How deep gogl digging in research? Also gmail account must be old/usable or can be new? If someone know share pls, thx

Depends on your goals.
If you want to test things with GMB you can try using any kind of the information with them. But if you need the listing I would recommend you to use your real information.