First of all, decide on how large a sum of money you can spare to start your investment portfolio. If you do not have the required amount at present, start saving money in a savings account or some other interest based earning source that will separate your investment money from your day to day expenditures.
Set reasonable goals for yourself and create a timeline for the savings plan. There must be a future date that the portfolio must look forward to; may be your retirement age.
Or, if you are saving money to buy a house or a car; the timeline will help you identify the correct amounts required for those purchases.
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Decide on the type of the assets in which you want to invest in. The market offers many types of investment options; stocks, bonds, mutual funds, cash, Forex reserves, treasury notes, gold, commodities to name a few.
Do research on every one of them and then decide which of these assets are most suitable to your investment needs. For example Forex reserves offers big margins of profit but there is a strong risk factor associated with them, so do your homework well before continuing forward.
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Start making the investments. Bring out all your saved amounts in one account and start buying the assets that you identified in the last step. There is no need to make all investments at once. Start carefully, and after getting reasonable results start building up your complete investment portfolio.