Along with the previous advice, I'd do two more things. I'd opt to do the ROTH 401k option as all your gains will be tax free, and as a young whatever you are, your tax rate is most likely nothing now anyways. It's a pay me now (Roth401k) vs pay me later (Traditional 401k) where your contributions and gains are tax deferred. I do t know about you but I don't want the government leeching even more off my success as I get older.
The second thing you should do is look into the different funds available. As said previously, you can do the retirement date based scaling system, the Bright horizon fund, it's a set it and forget it. Or you can do a little research on the other funds like Russell 2000, S&P 400,500, REIT, and International. If you click the actual fund it will show you what the fund consists of, (ex 2.4% APPL, 2.1%GMR, etc. it will also show you the past performance and give you a basic idea of who the fund is geared for (ex "this fund is for moderate to longer term investors consisting of small and medium cap stocks)
Regardless of what you decide to do, you're well ahead of your peers that have decided the Sizzler is more important than saving for retirement.