Help!

How in the world do you discipline a 15 month old?

I don't like to spank/hand slap, but will do it if it is extreme situation - like if he reaches for the stove or runs into the road he will get a spank - just one, enough to scare. But i dont want to use that for every small thing as that doesnt feel right to me.

Can you ladies and gents assist me with some ideas and whatnot? Hes not talking yet much so i dont know how much he understands.. i dont think a time out would work yet?