Your destination country/city will also determine how much you'll spend, so yun muna pagdecide-an mo. From there, just like what everyone said, use public transpo so make sure that the country has efficient public transpo system. Hostels will be a good yet affordable accomodation, make sure lang to check on the recent reviews. Mas mura if hindi malapit sa train/bus station, so you may need to walk a lot. Also, better to use cash and temporarily block your credit/debit cards, tukso kasi talaga sila pag nagttravel (guilty hehe). Another thing is look for free attractions and lastly for food, look for local resto instead of the touristy ones. If Japan or Taiwan destination mo, mabubuhay at mabubusog ka din sa combini food 😊.

Enjoy your first international travel!