As written above here, idle is where you feel it is right for you, yet reliable enough to sustain.
DA indicate you need to use a 27x10 during break-in, with 1:32 Ashless Lawnboy, or equivalent.
After the engine is broken in, you can mount a 28x10, with 1:50 and up synthetic oil (I use 1:80 Amsoil).
CF Props are almost always better than wood prop in terms of performance, but way more expensive. I've had good experience with XOAR and NX wood props, yet I prefer PT Model or Mejzlik CF props, which I find more to my liking in terms of overall power band.
What should this DA 100 idle at and what should its RPM be at full throttle ? Is a two blade prop better than three blade prop? Should I use CARBON FIBER or wood prop?