asalamo alaykom, is is allowed to ask a potentiol spouse how much money he makes, if he has a car and if he is searching for a house. Ustadh do you have other important questions i should ask? jazaka allahu ghairan

Asking how much do you make can sound normal or inappropriate, so it depends on the type of person and the way it is asked, and usually people don't say tell me how much is your salary. Above that ask about his religion and his manners, his work, how he spends his free time and who he takes his knowledge from, and ask those who know him well.