We all face the simple fact that this forum is secondary to the main function of ModularGrid so activity is very slow on here.
Its no one's fault and you can't blame people for not being here 24/7 or for not knowing how to give advice if they don't have experience of people's module choices.
Have you tried Modwiggler? https://www.modwiggler.com/forum/ there's probably more forum post action over there.
Buy a cheap case, get a few modules and start learning, its that easy, though never cheap!
This was my starter suggestion from a forum post that no one responded to:
That is where I would start if i were to be a beginner, the rest is personal learning and experimantation.
Enjoy your spare HP, don't rush to fill every last space, this is not like filling sticker books. Resist the urge to 'complete' your rack, its never complete so just relax.