Questions about Ranged Items and blocks spawning particles

I don't have much time to explain, but my questions are:
- I want to make a block that spawns particles when generated in the world, but it won't spawn them. How do I do it (if it's even possible)?
- I want to make a ranged item like a snowball (2D), but my item looks like it's trying to imitate a bow (Kinda 3D-ish). I can't seem to find the Tool type of model, only the Normal one, which appears to have taken the purpose of the Tool one. How do I make it so it looks "2D"?

Thank you in advance.