well, good to see people so young such as yourselves interested in the share market. Basically there are a few main rules if wanna invest in shares:-
1. Share speculation is illegal. Speculation meaning buy the share in the morning and sell it in the afternoon coz u suspect/know it would go up. Yes, this is actually illegal but shares speculation is hard to prove, so one has been caught for this so far.
2. Never borrow money from banks to invest. Schemes offered by banks such as margin financing is really bad. Just look at how the share market deteriorated when banks withdrew their margin financing scheme. Lots of people los money due to it.
3. Wanna invest, invest for the long term. As long as u invest for long term, you can never really lose out, unless the company u invest in goes bust. Best rule of the day is invest in blue chip companies (meaning companies that would never fail, such as Maybank, Genting, TNB etc). The prices for their shares might be high, but at least it is minimal risk. In the long term, u earn income from their dividend and u would also profit from the definite share price increase.
4. Look at how the interest rates are going. Basic economic understanding of share prices are if interest rates go up, share prices would come down and vice versa. Benchmark the Base Lending Rate (BLR) and look for possible trends that BNM might take, such as if u read in the papers that govt wanna fight inflation, means that the interest rates are soon to be increased.
5. Look at how other major foreign share markets are performing. NYSE, Nikkei, Times are all relevant to the performance of our share market. If they go down, most likely Malaysian share market would follow suit.
6. Do your homework. Current share prices reflect the future prospects of the company. So you have to know more on the future performance or outlook of the companies u wanna invest. Look also at their dividend policy. Some shares have high prices is not because of good outlook but rather than that company has a high dividend pay out policy. So it the short term, it might be worth investing, but in the long term, it tends to be a bit risky coz the moment that the dividend pay out slows down, the share prices for these counters are going to plummet down.
7. Lastly, if you have not studied economy as a subject, I would suggest you do so. Read up on particular topics such as Portfolio Theory.
Well, best of luck and hope my info here is relevant.