Don’t fall short.
Many don’t plan for retirement. 
The best age to start saving for retirement  is 30
Here is an online book that can help in your early planning stages. 
Gives you a general idea of financial planning across the board.
This is not by all means the only resource you have, please make sure that you surround yourselves with subject matter experts in all the fields related to your financial success.
And make sure that you select a trustworthy, competent and helpful financial planner.