This guide is very helpful:
http://wiki.project1999.com/Ultimate...ng_Money_Guide
In short for early levels keep all bone chips, they sell for 10pp a stack to players. Also keep all low, med, high quality pelts. Most low and med pelts sell for 1pp per, but high quality cat/wolf pelts are about 10-15pp per and High quality bear skins are up to 30-35pp per. They are really good early on money makers. Also keep all your spiderling silks, they sell for about 1pp per silk or 20pp per stack.
If you head to Crushbone at some point, keep all the belts/legionnaire shoulderpads as well as they sell well to other players farming faction. About 1pp per belt, 5-10pp per shoulder.
Someone correct me if I'm wrong on the pricing, just what I recall here.