Automate your savings so that you have money taken directly from each paycheck and deposited into a 401(k) or other workplace retirement account. If that's not an option, automatically have money transferred out of checking into savings each time you get paid.
If you're just starting out in the workforce, the very best thing you can do for yourself is to get started in your workplace retirement plan. Contribute enough to grab any matching dollars your employer is offering (a.k.a. the last free money on earth).