We too often let the material things serve as indicators that we're doing well, even though something inside us tells us that were not doing our best. That we are avoiding that which is hard, but also necessary. That we are shrinking from rather than rising to the challenges of the age.
The first and the most important thing is to know that life is one and immortal. Only the forms, countless in number, are transient and brittle. The life everlasting is independent of any form but manifests itself in all forms. Life then does not die... but the forms are dissolved.
Whether you believe in God or not does not matter much, whether you believe in Buddha or not does not matter so much; as a Buddhist, whether you believe in reincarnation or not does not matter so much. You must lead a good life.
No work or love will flourish out of guilt, fear, or hollowness of heart, just as no valid plans for the future can be made by those who have no capacity for living now.