Make sure that you have a sound business plan. You should be clear about the business you are trying to do, the amount you need to spend, your target market and the ways through which you will put in your efforts. Try to have some ample cash for the next couple of months as business do not generate profit overnight.
You should be mentally prepared to incur losses in the start and have sufficient financial backing. Make sure in any case your business process is not halted.
Keeping in mind your target market, you should advertise your products carefully. Make sure that the target audience is actually viewing your message and you are not just wasting money on advertisement expenses.
Open a dedicated bank account for your business and keep it separated from your personal account.
Have a closer look at your commodities and invest a portion of your profit in those products which bring you more business.
You do not want to waste your money, so spend it carefully and be patient if you face losses.