How can I make a part that gives a player a tool when stepped on?

It's simple. Here's a very short tutorial on how to do that.

1) We'll store a tool inside of ReplicatedStorage, I stored a hammer called "hammer ".

2) We'll now add the brick that gives the tool when touch.

3) We'll now add a remote event to ReplicatedStorage, and name it "RemoteGiveTool".

4) Now, we'll add a local script to the part, and type this :

function onTouch(hit)

    if hit.Parent.Humanoid ~= nil then

        game.ReplicatedStorage.RemoteGiveTool:FireServer()

end

script.Parent.Touched:Connect(onTouch)

5) Now, we'll add a Script in ServerScriptService which is what the remote does when it's fired, and type this :

game.ReplicatedStorage.RemoteGiveTool.OnServerEvent:Connect(function(player)

     local cloneOfTool = game.ReplicatedStorage.hammer:Clone()

     cloneOfTool.Parent = player.Backpack


end    

6) We're done! Now whenever you touch that brick it will clone the tool we placed in ReplicatedStorage and place it in the player's backpack. Hope it helped!

As far as your script goes, basically a lot of things went wrong. For example, I dont remember leaderstats existing in the character(hit.Parent), but rather the player of the character; So you should have searched for leadersats in the player of the character instead(you did put leaderstats in the player, right?). In addition, the way you checked for the money(player.leaderstats.Bucks.Value > 10) would be saying that you had to have over 10 dollars(e.g $10.1) to purchase the sword worth $10. The appropriate way to check for if the player has equal to or over $10 would be to use ">=" instead of ">". I made a rough edit of your code, which should work; though i cant assure you that:

local function getPlayerFromCharacter(character)
    for _, player in pairs(game:GetService("Players"):GetPlayers()) do
        if player.Character == character then
            return player
        end
    end
end

script.Parent.Touched:Connect(function(hit)
    if hit.Parent.Humanoid then
        print("it was a player")

        local player = getPlayerFromCharacter(hit.Parent)
        if player.leaderstats.Bucks.Value < 10 then
            print("u broke boi")
        elseif player.leaderstats.Bucks.Value >= 10 then
            print("purchasing sword...")
            local sword = game.ReplicatedStorage.ClassicSword:Clone()
            sword.Parent = player.BackPack
            print("sword acquired")
            player.leaderstats.Bucks.Value = hit.Parent.leaderstats.Bucks.Value - 10
            print("sword has been paid for")
        end
    end
end)

im sorry im rusty at this