Can I use my laptop to mine bitcoins? I was just wondering if it is possible to mine BTC using my laptop.

If so, what sort of graphics card should I get for this computer and 
what could I expect to mine in bitcoins a day with a single graphics card.

I would really appreciate your advice!
The times when one could mine Bitcoins with a laptop or graphics card are long gone. You would never even cover the cost of the electricity used. Bitcoin mining is done with ASICs now.