First and foremost, traveling overseas is not expensive. Actually, traveling is cheap and always have proper documents that are required in that foreign country you're going on time.
Use online platforms like Go Overseas to read about companies, use tour companies to organize your trip and always move with enough money; for example, in Uganda, you have got a lot to spend on if you use a tour company, which knows the interesting corners and always tell them your special days. I was lucky Patrick asked me if I had any special day during the trip and, indeed, it was my birthday on the last day; little did I know that the company had organized for me something. I was really so happy.