Need help creating custom particles

You can write your topic however you want, but you need to answer these questions:

  1. What do you want to achieve?
    I want to create my own particles in roblox instead of using outdated free models.

  2. What is the issue?
    The issue is I do not know any apps/websites to make them. I know I can use adobe but I am pretty broke lol

  3. What solutions have you tried so far?
    I have tried to do some research but not much luck in finding what I need.