You have to find a trustworthy man to stay there while are you praying with the congregation if the masjed is not that far. Your prayer is valid in the Restaurant but you are sinful for missing congregation in the masjid if it is close to you. As for living in your country, this is permissible but living in a Muslim country is the ideal situation for you and your future family.

1) i live in france and i have a restaurant alhamdoulilah . But i can t pray dhohr , maghreb and isha in the masjid because i have to be in the restaurant so i pray in the restaurant is it permissible ? 2) can i stay in france? I was born here, i m 25. I am single and live with my family. I can practice my religion without restriction alhamdulilah.