Try to have them be similar, but exact doesn't really matter (in my opinion). For example, if your keyword is "back pain", backpain.weebly.com is obviously taken, but backpainsolutionsnow.weebly.com is probably available.
Thanks!
Just clear another thing up...
Tier 3 should link to tier 2
Tier 2 should like to tier 1
and tier 1 should Link to my Money site?
All through anchor text right?
How many web 2.0s on each tier would you recommend?
Pretty much, yeah.
And it depends on a lot of things really... quality of the web 2.0s, how many links on the next tier you're sending at them, etc. The higher potential of the site = more web 2.0s and more backlinks overall.
Jared
yes that is correct but dont use all the same anchor text, you want it to appear natural as far as how many is up to you the more the merrier!