Hi Debater !
As a beginner myself, C-pen players need a Flexi-blade, medium-throw rubbers, light-weight( 140 - 160 grams ) setup , All- or All or All+ or Off- rated setup ( both blade and rubbers together ) .
For RPB, faster BH rubbers will develop power, consistency, confidence and good strokes. Heavy rubbers will affect balance for RPB so it is better to have a light-weight BH rubber.
It is better to learn TPB first and then transition to RPB usually. But sometimes C-pen players go directly to RPB without really learning TPB.
Also Yasaka MaLin YEO is one of the most recommended blades! Similarly I think 729 C3 and W5 ?
Chinese - DHS setup
( tacky ) PowerG7 + Skyline TG2 Neo ( Off+ to Off++, flexi-blade, medium-throw arc)
Better to go with the Skyline TG2 Neo it will be pretty fast for 1 month then slowdown. Or if you like 729 SuperFX or 729 OEM rubber for something a lot slower.
But I am giving info for All-Round loop, attack, push player. If you want Pips-Out then probably you want something All- blade with less flex. Short-pips attacking is a lot of fun with C-pen !
And u can put inverted or LP on the other side and twiddle 
Cpen will put a lot of strain on shoulder,elbow, wrist and finger joints. Sometimes the handle can abrade the webbing between thumb and forefinger so watch out for that. Initial days will develop calluses along forefinger, middle-finger and thumb.
Therefore try to figure out your Cpen grip and lightly sand the edges of the blade for the best and most comfortable fit. You can even add wood-filler mixed with silicone sealant to bulk up the neck of the blade and sand it down. Also if the blade handle feels too thin wrap badminton grip to compensate.
Let me know if any info can help you with or if anything I share is useful to you
