Only after a careful analysis of your financial situation and prospects should one decide how much financial risk they should take as they invest their savings. This is not what a large number of first time investors do, however- they invest all of their savings (a rash and even grave error most times). One should also consider what their financial goals are.
The first step in an assessment in your capability of financial risk taking, you should examine how much money you could possibly afford to invest. Do you have savings stashed away? It is great if you do since they provide a great source to draw from. Before you get all eager and invest, however, consider what the savings had initially been for, and how long that purpose can wait since investments have a time period of waiting before they mature and can liquidated/reaped.
It is also essential that you do not invest any savings intended to pay the rent, or for food, or assist your family. This money should be off limits if you want to assure being able to recover form a major possible loss that you might experience. So immediately consider first how much of said savings that you should keep as insurance, and how much you should invest. If you have another source of major income (an inheritance for example), you will have only what you can spare from your savings to invest.
You should also consider how you can add to your investments as time progresses. Employment would provide a consistent source of income with which to increase your holdings, while also supporting you/your family. Eventually, you will be able to build what is called an investment portfolio or a (large) set of currently tied-up financial assets in your possession. In fact, you should speak to a (qualified) financial professional who will be able to advise exactly how much of your income that you could safely spare for investments. The investor can also determine how soon you could attain your financial goals.
In most cases, an initial investment of some sort will be required. Hopefully you will have done your research and found an investment that you are interested in enough to put money in. You should definitely be aware of all possible risks with the investment. Sometimes, the ideal investment is too expensive for you. Never borrow money to risk on any investment, as if you lose the money you will face severe punitive damages. Just work slowly to build up enough money to invest in it by carefully choosing some other investments.