So you have decided it is time to take the plunge and build a portfolio. Do you have enough money to make this move? Well, you might be surprised to lean that for as little as $50 you can start buying mutual funds, and for as little as $25 you can start buying individual stocks.

Not so long ago, brokerages and other financial institutions ruled the investment world. Stocks traded in round lots of 100. Mutual funds regularly raised their investment minimums, locking out the little guy. Small investors needed courage, dedication and ingenuity to get a toehold in the stock market. But, today it is as easy to build a portfolio on a tight budget as it is to start investing with a million bucks, thanks chiefly to the changes forced on the investment world by the Internet.

Even if you are a beginning investor, think in terms of building a portfolio rather than of buying one or two stocks or a couple of mutual funds. A portfolio is a collection of investments like stocks, artwork, bonds, gold and real estate. Your portfolio consists of all the assets you own. It represents the choices you have made with your money. Beginners are usually advised to start with mutual funds because each mutual fund represents a portfolio, too, in this case a portfolio of securities. It might be stocks, or bonds, or both. When you look at the prospectus, you will find out what the manager buys and what is in the portfolio. Planning and diversifying will serve you best in the long run.

Regular investments, monthly is best, are important in building your portfolio. Many good fund groups waive their initial minimum investments, which might be $10,000 or more, if you are willing to make regular investments deposited directly from your paycheck or bank account.

This type of regular, systematic investing is the very best way to invest in the stock market. That is because it takes advantage of a strategy called dollar-cost averaging, a method of buying stock or mutual fund shares by investing the same amount of money on a regular schedule regardless of the market price. Studies show that investors who use dollar-cost averaging pay less per share on average than those who purchase shares in a lump sum.

Regular, systematic investing also imposes an important discipline. One of the biggest mistakes novice investors make is buying and selling with their emotions. When the market soars, they buy; when it sinks, they sell, just the opposite of what a successful investor does. Signing up for an automatic investment program puts you on automatic pilot and removes the temptation to try to time the market.

Even though each mutual fund is a portfolio, one fund is rarely enough for an investor. Also many investors have worked up an appetite for individual stocks. Stocks, too, can be added to your portfolio. Many companies permit investors to buy stock directly from the company by using the same type of regular monthly investments just described for mutual funds. These programs go by the names of Dividend Reinvestment Plans (DRIPs) or Direct Stock Purchases (DSPs).

The drawback is that many of the most popular technology companies do not participate in these direct investment programs. In addition, many companies have added steep fees to the direct plans. Now, thanks to the Web, there is a better way to dollar-cost average into stock. Many stock purchasing sites allow you to make trades on shares of your choice for low per trade fees.

Although small investors can buy stocks, we still recommend a mutual fund or funds (or a similar index-based investment trust) as a core holding. You could budget $100 a month for investments and decide to put $50 in an index and $25 in each of two stocks.

How broad should a portfolio be? - Buying a large number of different stocks is time-consuming and distracts from focusing on the best stocks. Most investors cannot keep track of a large portfolio, so it is best to concentrate on just a few securities. A guideline for beginners is: