First things first, here's the networth values of everything:
Beatles wrote:mice ::   1
squirrels :: 2
hares ::   4
otters ::  6
hawks ::   2
workers ::  3
cash ::   1/3000
savings ::  1/6000
loan ::   1/1500
structures :: 500
free land :: 600
food ::   1/1800
Next biggest thing is what race are you?
There are several ways to get a high net, the best way for you would depend on your race and your preferred style of play. There are 5 basic methods of building an empire, farming, indying, maging, cashing, and reselling. I have a section for each here. Just scroll down to the appropriate section to read a bit about it. The guide is still under construction and a bit bulky as well, so it may not be a good idea to try to read the whole thing at once or you'll likely just get confused. Just read whatever pertains to what your trying to do and worry about the rest later.
The guide should help some but I'm sure you'll have more questions, feel free to ask any questions you may have. Either through a forum post, PM, or on AIM, whichever's easiest for you.
I know the voices in my head arn't real but they usually have some pretty good ideas.