There is no set level range. The level of players you are allowed to attack and the level of players who can attack you first depends on the individual level. The formula to calculate the range is level range = (0.1 * cmbtlvl) + 5. The resulting level range always rounds down. In other words, if you are combat level 63, you can attack players in the range of 52 (63 - 11) to 74 (63 + 11).
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.
on the pvp/bounty worlds
yes
There are no banks in PvP zones but there is a safe of keeping 3 items UNLESS you are skulled.
Take a look on the world selection.
Go on a pvp world.
Scamming, pvp, pvm, dueling, & merching.
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.
your asking a impossible question because you can't
kill people in pvp worlds they will have a lot of things