I have placed a link below that should take you to a site that should be able to answer your question.
Out of most the people who pvp are pures. It really matters if your defense is good and if you have good range level and the armor helps a lot.
The MAIN way to get good drops on pvp/wildy in runescape was to build up your E.P. but now it seems it would be worth your time to just risk a descent amount and find an oppenent who you think you can defeat who has good armor or weapon since you will get that as a drop.
on the pvp/bounty worlds
yes
You risk more items yourself, the more you risk the more you get. You get good drops if you are risking 25k or more on a pvp world. This means that you would lose it if you died, and it is not protected by the protect item prayer. There is a great guide on how to own in Pvp worlds here: http://www.gameolosophy.com/Games/Online/RuneScape/How-to-Own-in-Pvp-Worlds-in-F2p.538733
There are no banks in PvP zones but there is a safe of keeping 3 items UNLESS you are skulled.
Scamming, pvp, pvm, dueling, & merching.
Go on a pvp world.
Take a look on the world selection.
While on RuneScape PVP worlds, if you die, you only lose the items you are carrying, not those in your bank, never in RuneScape will a death directly affect your banked items.
Warriors I would think.
I think it is where yo can battle against a player.