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New college graduates have plenty of expenses competing for their limited paychecks. Student loan bills, food, rent and utilities can easily consume a starting salary.

But 20-somethings also have one very important thing going for them. Young people are in the best position of their lives to start saving for retirement.

Here's how to set up your first 401k:

Start early

Money you tuck away for retirement in your 20s has decades to compound. Make savings automatic, beginning with your first paycheck, and try to ramp up your contributions whenever you get a raise.

"Our goal for new employees just getting into the work force is we want to get them to save 10% of their gross wages as soon as possible," says Mark Berg, a certified financial planner and the president of Timothy Financial Counsel in Wheaton, Ill. Those who can't afford 10% right away can start smaller. "We try to target 4% to 5% initially and then as they get raises, we'll add a percent or two to the amount they are putting in," says Berg.

If your company has a waiting period before new employees are allowed to join the 401k plan, make note of that date and begin participating as soon as you are eligible.

Get a 401k match

An employer match is a powerful incentive to participate in a 401k. A company match of 50% of contributions up to 6% of pay for an employee earning $35,000 annually can boost that worker's retirement savings by $1,050 each year.

If your employer doesn't offer a 401k match, it's still worthwhile to invest in a 401k for the tax break. Young employees can contribute up to $16,500 to a 401k in 2010 and won't pay income taxes on the amount contributed until retirement.

Consider a Roth 401k

Some companies offer a choice between a traditional and a Roth 401k. Traditional 401k deposits give you a tax break in the year you make the deposit, but income tax is due when the money is withdrawn. Roth 401k contributions are made with after-tax dollars, and withdrawals in retirement are tax-free.

The Roth option can be a good deal for young people in a low tax bracket. "People who potentially will retire in a higher tax bracket than they are in right now should use a Roth," says Clark Kendall, a certified financial planner and the founder of Kendall Capital Management in Rockville, Md.

Scrutinize autopilot settings

Many large companies now automatically enroll new employees in retirement accounts unless they opt out. The most common default investment is a target-date fund. But the default investment strategy may not be right for you.

Pay attention to how much is being deducted from your paycheck, how that money is being allocated and what fees you are being charged. Employees must be given periodic opportunities to make changes.

Pick diversified investments

New investors have an opportunity to buy into the financial markets at low prices and benefit from rising equity values as the economy recovers. Choose a mix of stock funds, bonds and cash that fits your risk tolerance. If your portfolio loses money in your 20s, you have plenty of time to recover before retirement. Pay attention to the fees and expenses associated with the investments offered by your company, which can cut into your returns dramatically over time.

"If the provider offers low-cost index funds, indexes are a nice, low-cost way to build a diversified portfolio," says Berg.

Also, make sure you don't overinvest in your own company by holding too much of its stock. You don't want to tie too much of your retirement savings to your employer. "We recommend not to have more than 5% invested in any one company stock," says Donald Nicholson Jr., a certified financial planner for Donald W. Nicholson & Associates in Wilmington, Del.

Balance retirement with other expenses

It can be difficult to save for retirement when you also have student loan payments. While it's a good idea to pay off credit cards or other high-interest debt as soon as possible, student loans with low fixed interest rates don't necessarily need to be prioritized above retirement savings. "If you borrow money at 3% and can invest it at 4%, then you want to do that all day long," says Kendall. "If you borrow at 3% and invest at 2%, you are eventually going to go bankrupt."

Also aim to accumulate an emergency fund of at least three to six months' worth of living expenses outside of your retirement account in case you lose your job or incur an unexpected expense.

Take it with you

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When you move on from your first job, don't cash out your retirement account.

401k withdrawals before age 55 are hit with a 10% early withdrawal penalty and regular income tax on the amount withdrawn. Instead, consider leaving the cash in your old 401k, moving the money into your new employer's 401k or transferring your nest egg to an IRA. All three options allow you to avoid penalties and continue tax-deferred growth.

Also, some employers require workers to remain with the company for a certain number of years before the employee may keep the 401k match. Find out how your company's vesting schedule works and consider sticking around until you can take your employer's retirement contributions with you.

This article was reported by Emily Brandon for U.S. News & World Report.