What kind of lights do you have? 50 watts of lighting does not tell us a lot, since the WPG guideline is long obsolete due to the advent of newer types of bulbs. The WPG guideline can really only be applied to T12 bulbs.
That being said:
1.Can i grow swords mosses java fern anubais ?
Yes, most likely without any problems.
2.Can i grow carpet plants like HC,dwarf hair grass and dwarf sagittaria?
You may need carbon dioxide and fertilization for the former 2. The latter might be OK without them.
3.I have 2 filters one Top filter which came with the aquarium set and a sunsun
HW-302 Outside Canister Filter
There was no question here.
4.How much hours should i switch on the light ?
An 8 hour photoperiod is usually sufficient.
5.Am gonna use jbl manado as a substrate how much inch depthness should be
Depends on how deep you want it; 2 - 3 inches is a good depth.
6.plz say a easy way to sink my drift wood
Soak in a large bucket of water for weeks.
7.what fishes are best for this tank and how much ferts shoul i use
Depends on what fish you want to keep
There are lots of choices for an aquarium of that size.
In terms of fertilization, it depends on what fertilization regimen you want to follow. It also depends on whether you want to use bulk chemicals or go with commercially available products (though I am unsure of the availability of either in India).