Investments

Hi, I have 3 years left to retire and am planning to start investing in shares.My plans are 1)to start a SIP 2)to buy value stocks for long term investment, at least 10 years 3)to trade in short term growth plans 4)to benefit from IPOs! I know this might sound ambitious for a first time investor but I believe that it's important to take risks to make great achievements! Kindly advice on these things 1)Should I open a Demat a/c with SBI or Zerodha? 2)what should I do to trade online? 3)How can I buy IPOs? Actually I have done a lot of research but only have a vague idea about these .But I would not like to wait for long before I start investing. I read some of your blogs and find them interesting and convincing.Congratulations! Do continue with the good work. Thank you, Anu