How best to structure wordpress site.

[SamCUK]

I need help on how to structure my wordpress site to avoid duplicate content issues. Basically I have a main category page for each of my targeted keywords (about 12). From each of those though I want to create a category for each county in the uk and then about 15 towns within each county. This means I'm creating a LOT of categories. Eg: /plumbers/lincolnshire/lincoln x 15 other counties and towns /local-plumbers/cambridgeshire/cambridge x 15 other counties and towns (I have about 12 main keywords I'm going after) I'm basically creating a category for every town in the UK going after long tail keywords. What is the best way to manage this in wordpress? Advice from another question I posted on here is to write a unique category description for each one as the posts in each category are almost identical. The other problem here is I'm ending up with hundreds of links on a page. (They can't all be seen by the user as I'm using a drop down menu plugin). Any advice appreciated.

[TomRayner]

Dan Shure wrote an excellent Wordpress guide that I think that addresses a number of your issues.  Rather than repeat him, here is the link as it really is very substantial and I hope it can help you.

[TakeshiYoung]

Having a lot of links in your navigation isn't a big issue.  Just understand that the more categories & pages you have, the more links you will need for them to rank well.  So you are really setting yourself up for a big link building project getting relevant backlinks for all those pages.  But from a site architecture standpoint, there is nothing wrong with the way you are setting it up.