Please I Need Some Advice On The Stock Exchange

sorry if this sounds absurd, i am totally a novice to the stock market, i  recently invested 50,000 naira in West African Portland Cement, 50,000 naira in intercontinental(through a jobber, if i am correct, got me my CSCS numb with Shalom Investments and Securities ) and also bought the recently closed intercontinental public offer with 50,000 naira. Now I am planning to buy First Bank Public Offer with 250,000 Naira.
I got questions to ask.
1. What is the difference between collecting a Shares Cert or including my CSCS  number so that they pay the money straight to my a/c
2. Is it safe to include my CSCS number? because the jobber (If I am correct, don't mind me please) told me to be very careful with it.
3. How can i monitor my share? will be Ok if online.
4. Though my profit depends on how well the company is doing i think but like how much can i think of in the next 7 years.
Please your post will be highly appreciated.