How can i make this blinking script work? I really want to know how for i am new to scripting.

So there is two things we will have to change to make it work and one thing to change to make your code pretty.

The first is that you set Blink to the parent of the Game with Blink = Game.Parent. I'm going to guess that if this is a part then it is not the parent of the game, but the parent of the script. We will want to change our script to read.

Blink = script.Parent

Now if the script is placed so that it's parent is the block then it will start blinking in transparency.

The other thing is that we have to add one more end at the end so that we end both the if statement and the while loop. Here's your code with those changes applied.

Blink = script.Parent
while true do
wait(5) -- This is my cosmetic change that I mentioned! This is a comment.
Blinking = math.random(1,5)
if Blinking == 1 then
Blink.Transparency = 1
end
if Blinking == 2 then
Blink.Transparency = 0
end
if Blinking == 3 then
Blink.Transparency = 1
end
if Blinking == 4 then
Blink.Transparency = 1 
end
if Blinking == 5 then
Blink.Transparency = 0
end
end -- Added an end here. This is also a comment.