Is there a large assortment of particle packages out there?

Just the more typical ones? assembly line, scratch sparks, snow, plants, fountain, sign lighting, etc.

There are so many adjustments, I get kinda discouraged and wish there was way more… (any?) presets so it doesn’t take my creativity to a grinding halt. Blender market has a few but seems too specific. I wish for a basic assortment of effects.

BlendSwap has a couple of particle demos:

You might also look into using some Blender add-ons that are oriented around VFX specifically: