A question like this is best asked on a private server site, where your more likely to get quicker reply from someone who knows. I'm creating a private server with my friend and you need a client and a source that will work together for your weapon.
Godswords.
There is no weapon stash in Runescape. If you need a sword or armor, you can either buy it at the Grand Exchange located at Varrok, or you can make your own.
advice: get a weapon
A Weapon
There's weapon stores in almost every town around Runescape, look for a Sword, Bow, or battleaxe icon on your mini-map.
If you have a weapon in your inventory, click on it to wield it. This will un-wield any other weapon you have in your weapon slot.
nothing
Any weapon that has a great crush bonus:BattleaxesMacesMaulsWarhammers
all you need to do to get poison off of a weapon is use a cleaning cloth.
Gravite shortbow.
Dragon claws
There are many ways to get a weapon in runescape such as: killing monsters making them from smithing them or buying them from various stores.