Rather than investing directly in stock market, suggest to go through the Mutual Fund route and even in Mutual Fund select the SIP route. You can start with equity diversified mutual fund like the balanced fund which offer balance between equity and debt instruments. Also suggest to allocate the Rs 5000 amount across 2-3 Mutual Funds Categories.
My suggestion will be to go with the following allocation.
1. HDFC balance fund - Rs 1500
2. UTI Opportunity - Rs 1500
3. IDFC Premier Equity Fund Plan A - Rs 2000
Keep a long term investment horizon of atleast 3-5 Years. Monitor the performance of your funds every 8-12 months.