Sri Lanka Children Orphanage Humanitarian Trip

I have set a goal to volunteer in Sri Lanka through the International Volunteer HQ. My volunteer experience will be helping build orphanages for the homeless children and teaching those kids about everyday life. I would like to stay out there at least a month or two. You can go to https://www.volunteerhq.org/volunteer-in-sri-lanka to see all that I would be doing with my time. As a college student (as you can imagine) I don't have a very large income, nor much money.I have always wanted to serve, so any help that could be given would be greatly appreciated. Thank you, and God Bless!