How do I make particles fly in place in the sky?

game.Players.PlayerAdded:connect(function(plr) --Define Player
    plr.CharacterAdded:connect(function(char) --Define Character
    local name = plr.Name
    if name == "(roblox updated, so the name for the players using it will vary)" then
        local sparkles = Instance.new("Sparkles", char.Torso)
        sparkles.Enabled = true
        sparkles.SparkleColor = Color3.new(255, 255, 0)
     end
    end)
end)

I don't know what you're asking. If you want particles in the "sky" (game.Workspace?), not the player, thne you could use a particle emitter, or if you're intent on using sparkles just do this:

local SparklePart = Instance.new("Part", game.Workspace) -- This is the part with the sparkles
	Part.Anchored = true -- Makes the part stay in place
	Part.CFrame = CFrame.new(0, 0, 0) -- The exact placement that you want the sparkles. The 0s are X, Y, and Z. 

local sparkles = Instance.new("Sparkles", SparklePart)
	sparkles.Enabled = true
	sparkles.SparkleColor = Color3.new(255, 255, 0)

If you're looking for particle emitters, look up "Particle Emitters ROBLOX" or something... Hope This helped! - Zyrun