How do you make a rotating script?

I'm good at JavaScripting, so I thought I was good at this. But I just figured out it's VERY different! There are some new terms. Can someone make a script that can rotate a model automatically so I can have spinning cogs?

while wait() do
	part.CFrame = part.CFrame * CFrame.Angles(0, math.rad(5), 0)
end

That will rotate the part 5 degrees on the relative Y axis every 1/ 30 of a second.