Different people are suited for different jobs. What job is interesting to one person may not interest another. One's hobbies and often their background play an integral part in determining their ideal career. Many people change jobs often, constantly searching for the one that suits them the best. 
My ideal job would be one that is flexible and in a relaxed environment. Hopefully it will be in the marketing area and will allow room for creativity. I would enjoy working in the research end of marketing, which would possibly provide me with the opportunity to travel to China and collect data.
In order to prepare for your ideal job it is necessary to have the proper training. You must study and acquire knowledge about the area in which you want to work. Most importantly you must have the desire to do the job. If you truly enjoy what you do, then working hard and acquiring the necessary skill will be easy and you will excel in that area.