Hi Ramana,
... and welcome to IIS
I'd go with the others and say that once you've settled into the hobby a little, then would be a better time to start buying more. Believe me, you'll end up with all sorts of unwanted stuff if you don't play it a bit cool.
However, once you do start buying more EPs, I'd definitely recommend buying just a couple of really good quality (Televue for example) ones rather than a 'set' which may seem better value. Usually the sets contain stuff like filters which you'll use once probably, or EPs which you don't like because they don't have sufficent eye relief for example.
Just my two bob's worth
Cheers,