The following are the major cities: Gemlik, Bursa.
About supermarkets, 1 possibilities exist (like "Market").
You can find 1 tourism places locally like "Yunuslar"
For gas stations you have 3 places with "Opet Gemlik", "Hazar" for example.
In term of bars/cafes you can find 3 places (like "Gurup Aile Çay Bahçesi", "Damla Aile Çay Bahçesi", "Hakan Aile Çay Bahçesi").
Are you looking for an apartment for sale/rent? Or interested by a house? You can check that on Emlakjet.