Newbie - Budget Start Up

So whilst it is apparent that my current set up absolutely needs a power meter. And it seems that all good cycling apps (Zwift, Peloton, sufferfest etc ) work well with a power meter.

Do you think a Power Meter Pedal or Crank would be the cheapest and easiest option. I think pedal is easiest but crank appears to be little cheaper approx. £180. Not now but in the future.

Page 3 shows my spin bike… And it looks like I’d need a 170*27 crank and the left side would be better?

https://support.jllfitness.co.uk/download/IC300%20PRO%20Manual%202018.pdf

Many thanks, once again

Reena