Service tax as company or as individual?

You can take service tax registration in the name of the firm of your choice. You need to apply & sign the ST applicaiton ST-1 as a proprietor of that firm. You will be required to give the address proof of the premises where you would be keeping records and issuing bills to your clients/customers. Rent agreement is a valid proof of address. 

Many thanks Mr.Manoj. Just one query - my rent agreement of my house is in my own name, can I still obtain service tax regn in a different name or should I rewrite the rental agreement? Are you based in Hyderabad?

A proprietor and a proprietoship firm is one and same. A proprietorship firm has no seperate legal existance. You need not rewrite your rent agreement. You can simply sign the copy of rent agreement by putting the rubber stamp of the name of the proprietorship firm. 

I am based at Rourkela, Odisha