If you want to initial level an marine aquarium setup Chennai.

Good size of the tank is 60cm*40cm*30cm..Price will be 1500 -2000 with stand
filter you can try DIY canister filter or you can buy simple canister or hang on filter with good filter materials.. filter rougly 2500–3000rs and filter material 1000rs.(ceramic ring , bio sponge, some coarse lava rock)
Salt mix is 250rs / kg. you can make 30 lit of water with 1 kg of salt
decoration sand and rock (dont spend too much in it 600–800 is more than sufficient)
Fish i ll suggest Nemo aka clown fish (2 pairs and if possible a tang or some damsel)
use one surface skimmer if you are interested
For light just Cheap LED strip or some good LED standard bulb is enough.
Avoid anemone for atleast initial 6 months.