Exemption from central excise for manufacturing Indl. oils

I wish to start a manufacturing unit for manufacture of Industrial Oils, lubricants and Grease and Textile Auxillaries. I hope to cross sale of Rs.1.00 crore in a year. I want to know the exemption limits from excise and excise slabs for different sales.

Is there enhanced exemption, if I register my unit as S.S.I. Unit?

Is there any way, to opt out of excise also?

Can someone reproduce those sactions, which you use to answer my above questions,  so that I know that your answers are autheticated and have legal binding, so that I do not have any problem/trouble lateron.

If I want to hire a consultant for day to day work related to excise and preparing and filing of excise returns, claims and refunds, representations, follow-ups, i.e., A TO Z work of excise, what will be his charges per year.