Some experts say that if you are putting the proper tension into the loop throughout the stroke all you need is a piece of straight mono, say 15#, approx the rod length to make good fishing casts. The point is Spey casts don't need to be ultra-picky about leader design like singlehand casts may.
That being said I would recommend building a leader of the standard 60/20/20% proportions with a taper down to the tippet you like (search on leader formulas on the forum search box).
One note Spey casting is most suited to the swing, but you can adapt it to anything you want.
I am a zero-indicator type guy so you'd have to ask someone else about that - there is a lot of bobber talk on Speypages.com lately you might check out, I haven't read those particular threads but they appear quite active.
Drop by one of the spring Flyfishing Forum Nor'easter Spey Claves to get some great first hand instruction (dates TBD).
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