to Broan:
I think the OP is asking
where different harvest items are found and
what they are used for... not
how much he can sell them for...
to vbt:
It can be overwhelming to collect items at random and hope that you will pick up something you need. Storage space is always at a premium and while you don't want to destroy something of value, you just can't keep
everything!
There is a good article that may help you
HERE at EQ2 Traders Corner
There is also a good description on the Prima Game Guide site but I couldn't get there to make a link.