How to make a gradient on two paths

Hello,
I am fairly new to Illustrator, although have used Photoshop, Fireworks and DW to some degree in the past.
In CS4, I am trying to make a country map with different counties or states. Using the map of the UK and including Wales, Scotland, and some of the counties as an example. I need to portray the whole country, but only highlight a specific part of the land, along a train line and so quickly fade away to almost transparent in the further edges.
Using the pen tool I have traced the country and county borders as paths. I then used the fill tool to make each country, or sea, a different colour. Now I want to fade the edges of my map away to transparent to bring attention to the middle. I have drawn another path on top and beyond the edge of the artwork and tried to make a transparency overlay and gradient in this path to make it fade to the edges. However, this does not work as I had hoped for three reasons.
1) the darkest edge of my 'fade path' does not blend into the country below but is quite an obvious line.
2) the gradient is a different colour as it sits on top of other paths of different colours.
3) the gradient is linear, from top to north, of radial, from a certain spot. I need the gradient to flow out in all directions from a un-uniform 'blob' roughly in the middle.
Can you please tell me how I can achieve my aim?
3) I had one more query when tracing my map ... I have two shapes and the paths align along one edge, think of the south border of Scotland, and the north border of England for example. At the moment I have these two paths running alongside each other but not joined. So if I didn't draw my pen accurately, there are small pockets where they don't touch. Ideally I would like to borrow the other path line for a time then leave it as it continues on it's own route.
Sorry if I mixed up the terms, I hope you can understand me.
Hope you can advise which tools I should be using, or some tutorials I can follow?
Thanks in advance.

Thanks Mylenium. I've certainly learnt something from both replies. I have now finished tracing the countries using your paste and cut method. It was quite a tedious job! I also found using the lasso tool and direct selecion tool that I could highlight just the area that bordered the next county/country. My the latter stages I had to select multiples, join them and then add, delete more anchor points. I'm sure there must be an easier way to trace an image!
I tried the live trace, but the map I was using was too detailed it traced geography and not the borders. Anyway, I'm there now. Thanks for the advice.
I think I'm on the wrong track with the 'blob'. I didn't mean the blob tool on AI, but was referring to the middle content of my map following the railway line, which is the bit I wanted to 'stand out' from the rest. I have perservered and think I'm getting somewhere with the gradients.
Thanks also Skullmaster for the idea of gradient. It wasn't working how I need, but from your link I found how to make a 'transparent opacity mask' which I have used with a photo in the background to some effect.
It is a feature rich software and hard to know what to look for when I'm not sure of the terms. Unfortunately I have a deadline for what I'm doing and this map is only a small part of it. It will have to remain a work in progress as I slowly learn more techniques.
I'm sure I'll be back with more ...

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