Fire Upon Touching?

I know this is probably a simple question, but I can't seem to figure it out. Essentially, I want your character to "catch fire" when you step on a fire. I know how to do the damage over time and all that stuff, but what I'm wondering is how to create a fire on the character's torso. Any help with this would be very much appreciated.

Put this script in the block you want to catch players on fire:

script.Parent.Touched:connect(function(hit)
	if hit.Parent:firstFindChild("Humaniod") ~= nil and hit.Parent:firstFindChild("Torso") ~= nil then
		fire = Instance.new("Fire", hit.Parent.findFirstChild("Torso"))
	end
end)

This might not work because I didn't test it

fire = game.Workspace.Part.Fire
part = game.Workspace.Part
plr = game.Workspace.LocalPlayer

function onTouched(hit)
	if plr:onTouched(Part) then
		game.Workspace.plr:GetPlayers("Torso")
		plr.Torso.Fire.Enabled = false
	end
end

script.Parent.Touched:connect(onTouched)