Example blue chip stocks. Coca Cola, Mc Donald's, Walmart, Pepsi, etc. Who can I purchase shares from online?
I think you should read JNC's answer very carefully. He gave you an excellent answer and excellent advice. I am going to add a little bit to it.
An investor with not a great deal of money to invest can improve his chances of a decent return by buying a portion of a broad divisified portfolio–a mutual fund or an index fund. Mutual funds can be purchased directly from the mutual fund companies. Exchanged traded index funds are purchased like stocks through a stock broker. There are index funds that invest in only blue chip companies.
One such very popular index fund is EFA. It is a fund that invests in world wide blue chip companies outside of the U S. The average annual return during the last 5 years is 14%.
Its holding include British Petroleum, Toyota, Nestle, and other similar blue chips. The largest holding makes up less than 2% of the portfolio. One really nice thing about this fund is its assets are not linked to the dollar which has been dropping like a rock.
If however you are wanting to invest in U S blue chip companies, consider OEF which is an index fund investing in the 100 largest corporations of the U S. Its 5 year annual return however is less than 4%. Not too great. But it should improve in the future. The return for this year is a much more respectable 15%.