The answer of ur first question is not so simple and straight forward. It needs a whole lot of thinking and wise decisions. But keeping it simple i would suggest u to Invest proportaionately to every avenue of investing. Avenues Include Stock market, Mutual Funds, Bonds, SIP, Fixed deposit, Liquid CAsh, Properties, etc.
Investing in stock market has the potential to give higher return from other investment avenues, but it also has the higher risk of getting degraded. Ur investment may double up in years in stock market but it can also come down drastically. Whereas once u invest in Fixed deposit, U become free of tension but with less return.
So everything depends upon ur risk taking ability. Being a bachelor u can invest more in stock market bcoz u need not to worry for ur family but if u r married , then u want toplay safe and invest more in fixed deposit or bond etc which r considered to be safe.
Rest ur own judgement. I m giving u a link which will help u decide ur RISK TAKING CAPABILITY and will help u in distributing ur surplus balance into proper area of investment.
http://content.icicidirect.com/personalfinance/personalfn.asp
in the above page, u will see TOOLS on right hand column, there u will see INVESTMENT PLANNING. it has two sub category. Check the both. And be wise when u answer the questins there.
NOW about ur second question,
Its never wise decision to convert ur healthy fixed return schemes into stock market. Better u invest ur present surplus investable amount into sttock market. It will be safe and fruitful also.
Hope my suggestion will solve ur querries. Check the above mention link definately.
And i request all of u to put Best answer mark to the answer which u like most.