21, entrepreneur, how do I invest for retirement,

[Don Ellestad]

Situation: I am 21 years old, I own a trucking company that pays 100% of my monthly expenses, I pay myself a salary (Filed as S Corp) I'm not brand new to the investing world but would like help from more experienced investors on how to invest my salary.

Question: In your opinion, how should I start investing for retirement? The first decade a lot of my investment allocation will be real estate, but I would like advice on investing maybe 10-20% into more passive, compounding investments.