If you are going for a graduate program in Art History, start looking at the schools that offer them. Look at the requirements such as GRE for entry. How do you show these schools that you are a “good catch” for them?
Without knowing what your background is , what you are studying, how competitive you are for graduate programs in this field , it’s difficult to give any advice on how you might get grants, stipends, which can come with doctorate programs In the Humanities. Not so much terminal Master’s programs. Loans are often what they offer, maybe small grants. But do look and see what’s affordable.
My advice for you, if you want to go for a graduate degree here in the US , unless you get funded or can afford to pay out of pocket, is to pick an area that has schools with such programs that you like at the state schools, and come to the US after competing your studies and baccalaureate equivalence, and find a job here, preferably in the Art History field, but anything to make ends meet while you do some volunteer work in the field, case out the museums and resources , and apply to the state schools after you have become a state resident. Usually takes a year. Look up the requirements at the targeted schools. Make connections at events , maybe take free or low cost courses, not for credit but to get to know people with this interest. Some state schools very lenient about in state tuition as long as you are not a degree seeking student; just a local address might do. Non credit courses at schools, art centers, museums , programs are great inroads to that next step as you get residency status.