Start your own business is not as simple as you think. Probably now you are an employee of one company and want to increace your earning with making own business. I will give you one example about making simple own business here. I already did this sample and this is real.
Below is things that you have to thing to start your own business:
You have to have a product. Choose the product you like it.
You have to have money to buy that product from producer.
Try to find the essensial market for your product
Try to allocate your time to run your business