Having the right amount of money to take, the availibility of money in case of emergencies and budgeting while you're away are all very important issues to make sure you don't come unstuck during your trip.
The money you spend when you're away can vary massively depending on the level of accomodation you choose, the trips and activities you want to do, the amount you eat out and importantly how much you plan to go out and party. All of these expenses can be cut back on or maxed out depending on your budget and requirements for your trip.
A good tip is to try to pay for as much as you can before you go, those trips and flights you know you'll be taking can all be booked in advance and allows you to see more easily how much is left in your bank as even the most organised person will forget an expense or two.
Try to keep an eye on your account and budget a certain amount of money for each country, obviously some countries will cost you a lot more per day to stay in than others, as a rough guide, countries like Australia will cost you around £1,000 per month to have a good time and others like Thailand can be enjoyed for as little as £500 per month with the abundance of cheap acommodation and food.
We do recommend having a credit card with you for emergencies but try to use it only when needed, you may need that extra money later in your trip and there's nothing worse than having to cut your trip short because you've run out of money. Preparation and constantly keeping an eye on what you are spending will allow you to enjoy your trip to it's maximum potential.