Uh,if ure new use GuildWiki,it will help u a lot.
Ignore post with 'no use of salvaging' and salvage whatever u can,since u will need any money that u can get.
Dont salvage the bow,there is rly no use of that mod

If mods can again update 'baseline pricing' on rares,greens and mods that would help ya(but it looks nothing from that....)
To know is some item worth salvaging,selling or merching the most important thing is max dmg,skin,req and dmg mode(and lot of other things) so the best thing is to go on Guild Wiki and look for whatever u need.
Cheers