Try to dive what things are you good in ?could be cooking?designing ?or anything that you quite fonds of,and make sure that you're master with ur field.and btw,in my opinions,opening a restaurant would be good if you;re good in cooking with friends recomendations.thats among the best business that can last for quite some time,for electrical stuffs or cars,that's very hard,coz not everyone can afford it everyday.