First you have to invest then you can earn. Buy something people want to have then change the place from where you bought it. Then sell it by increasing the value of it.
So Simple! Actually bussiness is nothing but selling time, place, efficiency, experience, thought etc. How?
In the above situation you are actually selling place. So, How you can sell time? Let you have a piece of land now its value 10000$ after one or two year its value will increase. So you are actually selling time.
So if you are thoughtfull enough you can sell your thought too.
So let summarise it. Your item could be any goods but think about time, pleace, experience etc before starting business