How do I make terrain generation, via perlins noise?

Hi, I'm trying to make a sandbox roblox game similar to minecraft. Meant to be with more ore and my own choices of ore. I need to learn how to make terrain generation, so I could be able to start progress on my game.

If you can help me, I'd be very thankful.

I've started some off, unsure of the rest.

Script:

local wantedheight = 0 --I don't know this at the moment. If you can help me out, I would be very grateful. Also had to use 0's to not make it go red. I'd want this to be atleast 64.

local function generateterrain()
    for x = 1,50 do
        for z = 1,50 do
            local grass = Instance.new("Part")
            grass.Material = Enum.Material.Grass
            grass.Color = BrickColor.new("Lime green")
            grass.Size = 2,2,2
        end
end
    end