1." Is it good idea to do frequest buy and sell whenever gain takes place?"

- That is upto you.  I sometimes do that.  But, Warren Buffet's advice is buy and hold undervalued stocks. 

2. "Is there any software I can use to view multiple companies' real time stock prices simultaneously at the same time?"

 - There are many software in the market and your broker should have one also. 

You are welcome. 

 I am going to Europe today and will not return until the end of this month. 

Good luck on your trading.