Well it all depends on where you're going, and how long for. If you wanna take a typical year long around the world trip, spending time in a combination of cheap countries and expensive countries, then a lot of people spend around $20000. It sounds like a lot of money, but think about it. That is all you require to travel around the world for a whole year! How much do you currently spend each year living the life that you do not want to live? Some people spend more, some people a lot less. It all depends on what you spend your money on, where you stay and where you eat. But $20000 is about an average price. If you do not do your research however, that $20000 will be gone in no time! So you have to be careful, and always reflect on what you're spending your money on. What you need to spend your money on to travel around the world is transport, accommodation, food and activities. Carry a knapsack or bag with a few clothes and accessories such as a camera.
This is an agency that provides its members with a listing of the organic farms around the world that need volunteers to help them during certain periods of the year. People who do this aren't paid but they do get room and board and learn all about organic farming. It's been around since 1971 and was started in England by Sue Coppard who worked as a secretary in London. She wanted to ensure access to the country for people who lived in the city. There are WOOF farms hundreds of countries.
You do not need to pack your whole wardrobe, nor do you need to buy endless amounts of souvenirs, your photos and memories are the best souvenirs you can get! Have a good look around for flights in advance, there's always plenty of airlines competing for the highest price, so do not just pick the first one you find. Compare a whole bunch until you find the cheapest one. Take public transport where ever you can, and walk whenever possible because not only is it free, you also see a lot more! The cheapest places to stay are hostels and guest houses. Most places around the world have dorm rooms which are cheap and you will have to meet a lot of other travelers and have some great experiences. In places like Asia, you can have private rooms in guest houses extremely cheap. In Laos for example, you can get rooms for as low as $2-$3 a night! And even in more expensive places like Australia, you can find dorm rooms for around $20 a night. That is a lot better than paying over $100 for a hotel room, and it is a lot more fun! Most hostels around the world also have kitchens, so you can purchase and cook your own food, saving you a lot of money. If you want something to eat out, try to avoid touristy areas, and eat where the locals eat. Street stalls have a few of the cheapest food you can find, and are often delicious and local. In South East Asia you can get street food for around $1 a meal. In Italy I got delicious pizza for about $2 per slice.