Stock Market in Malaysia

I want to know  what are the opportunities in the Stock Market ?

What kind of market place is the stock market ?

Who is the stock broker and what exactly is its role?

How many different types of stocks are there ?

I am confused when to buy and sell stocks in stock market?

I know online trading is very convenient. What is online trading?

Im confused about stocks issues and ratios in stock market investment. Can explain more about this?

Anything important thing I need to know about Warrants in Stock market investment?