Isometric games are the best, I agree
I first started working on isometric engines about a year ago, but it still took me over 8 months to figure it out.
I didn't get any help from anyone, no samples, no posts. Just some good old fashioned algebra and a little trial and error.
Today i've got a tileengine like the one in the Rollercoaster Tycoon games,
and i'm damn proud of it. So in the intrest of "my big ego" i'd gladly help you out,
BUT if you have litte experience from top-down games, scrollers and such, I am affraid
that some of the isometric stuff will seem a bit complex.
where do you want to start? i could show you some of the simple stuff first