Dear Every person do any work before understanding every thing i.e. what is negative and what are positive output. but sometime he/she didn't get proper out put. If you get good output then your idea is good if you get bad output then your idea is wrong. It same as exam, risk 50-50%. If you are starting any project then finding customer is not enough. You have to consider many thing, like location, cost of raw material, raw material availability, cost of labaour and its availability with experience in that work, then last is customer finding. There are many hidden cost effect process which should be also considered like transportation, electricity wastage, etc. If you have till any query then ask me any time. I will try to help you.