Dental Insurance (warning: low quality photo images only)

After weighing it up, I decided not to bother trying to extract the cranks. Given the state of the rest of the drive chain I figured they were probably basically cemented in so I packed up the dahon to take it to the bike mans who removed the crank + pedals for a fiver. Money well spent I think. Also I got to indulge my fakenger day dreams by pedalling around town with a frame on my back.

They also disposed of the dahon for me. Farewell shitty friend who tried to kill me and destroy my beautiful face, fare thee well.

Anyway, out with the old and busted, its time for the new hotness:

This is a 'mock up' using the surly ogre forks I got from tallboy above.

I could use some advice on my 'next moves':

I need a new headset put into this frame, I was going to take it to the bikemans but he told me I should bring the fork in at the same time when I do. That seems like kind of a pain and surely he doesn't need the fork to know what kind of headset cups to attach? Does anyone know what I need to measure/ask him to do?

I'm expecting to buy:

A headset
Some spacers
A new stem ( pictured is the NVO one from the dahon which only works with the weird NVO stuff that I don't understand entirely )
Some chainring bolts
A chaintool (so I can rebuild the bolt cut chain that I'm now regretting bolt cutting though it seemed a great idea at the time)

I'm on the fence about needing to buy:
narrow wide chainring (could just use the old chainring for a bit? I'm not exactly going to be going offroad but cambridge roads are dire)
new cables + outers for gears + brakes (Can I just use the old ones? Is it not worth being stingy like that? There was a pretty long length of outers on the dahon)

In the future I'll definitely get round to things like switching to 9 speed, nw chainring, getting bigger tyres etc but in terms of getting a workable machine in the short term, am I on the right path? Any help appreciated.