Finances

Salary
Everyone wants to know how much they will get paid teaching overseas. Unfortunately a straight answer is impossible because teachers must consider salaries in light of other benefits offered by the school, like housing and health insurance, as well as the cost of living in the country. In one country a teacher could make $8,000 a year and be able to save $6,000 while in another country a teacher could get paid $38,000 and barely get by. Your contract should outline not only how much you'll get paid, but also how it will be paid, including the salary's currency and the way in which it will be paid (i.e., by local bank account, in cash, etc.).

Money
Before you go overseas be sure to alert your credit card company of your travels or they may consider overseas card use "suspicious activity" and block access your card. Credit cards are often not accepted at merchants in many countries. In third world countries when credit cards are accepted, their use is ill-advised unless the merchant is a major multi-national company like Hilton. When you do use credit cards, be aware that most all credit card issuers charge a 1% fee for overseas purchases. As for cash, the best way to get local currency is through ATM machines, since your debit card from back home should work around the world (check with your bank just to be sure). At an ATM you'll get the best exchange rate with no transaction fee, you can take out as much or as little as you need, and you don't have to worry about losing traveler's checks or finding a trustworthy bank.

Protection
Use common sense and always be aware of your money, especially in crowded markets and bazaars where thieves prey on tourists. Carry a bag that is hard to get into, with a zipper and clasp for example, or wear a money belt. If you carry a wallet, put it in your front pocket and wrap several thick rubber bands around it to make it difficult for anyone to pull it out without your knowledge. U.S. citizens can protect their identity at home while living overseas by signing up for a credit monitoring service.

Taxes
When living abroad you may be required to pay local taxes. Your contract should specify as much. You may also have to report your income and pay taxes to your country of citizenship, but probably less than you would if you were living in the country. A quick Google search on tax requirements for U.S./U.K./Canadian citizens will lead you to the information you need. Or, U.S. citizens can learn more about their requirements at the IRS's website, U.K. citizens can read about their responsibilities at the Directgov site and Canadians can find out at the CRA's website.