The sutta that you should live by, if you want to achieve success in your lay life - The layman’s welfare - is Dighajanu (Vyagghapajja) Sutta: Conditions of Welfare. In this sutta Buddha instructs rich householders how to preserve and increase their prosperity and avoid loss of wealth. This is The Buddha's Teachings on Prosperity.
The four conditions conduce to a householder's wellbeing and happiness in this very life are the accomplishment of persistent effort (utthana-sampada), the accomplishment of watchfulness (arakkha-sampada), good friendship (kalyanamittata) and balanced livelihood (sama-jivikata).
Here, endeavour is that effort put forth in earning money and wealth for the advancement of your life. Whatever you do in earning your living, you have to be an expert in it. You have to be knowledgable of the field of business. You should not be lazy but be enthusiastic in doing your work. Deliberation and skillfulness are some of the necessary elements to attain success. When you organise businesses skillfully your economy will, no doubt, increase. It enables you and your family members to live at ease without difficulties, troubles and worries.
Then you should know the importance of protecting wealth earned through enthusiasm and righteously working hard. Having known how hard earned wealth is protected and how it gets destroyed, you should know to protect it so that the collected wealth is not lost.
Good friendship is to associate with good people, people who follow a spiritual path. Your life has to have a moral foundation to enjoy external achievements and success. Material success alone is not enough, there should be an association with good friends. Good friends will guide you in right and wrong. They recommend a spiritual path while practising it. If association with a particular person leads to our welfare then that person can be regarded as a Good Friend regardless of his or her age. If you find a person with many good qualities in his life, whether elder or young, either from your own village or suburb or township, it is then good to form an association with him or her.
Next is a balanced life. It is the life that you live in accordance to your means and station in life. You must know how to spend money and live an unburdened, debtless life per the state of your income. Especially expenditure should be balanced to your revenue. You should also know how to lead a life with nothing exceedingly luxurious nor extremely austere but should strive to live a peaceful harmonious life following the middle way. You must be especially mindful not to have a competitive attitude regarding lifestyles.
Now, the reasons for the welfare and happiness in the life after death are to be considered. There are four factors that bring happiness to the life after death. The accomplishment of faith (saddha-sampada), the accomplishment of virtue (sila-sampada), the accomplishment of charity (caga-sampada) and the accomplishment of wisdom (pañña-sampada).