I like to get E first, because Yoricks harass is really nice. That E just deals damage and if they poke you back, you don't feel it. The E heals you a good bit. I then get W because it has that slow, which allows you to harass more. The way I harass is I W to slow them, then E to hit them, then Q to hit them again. I then get Q for the extra damage and speed to run away. A good way to take down Towers faster would be to hit them, then instantly click q. It does another hit immediately. If another minion wave is coming and your Q is still active, hit a minion to reset the CD and pop out a ghoul to give you more damage. You should also W when you can while taking down a tower and E a minion. With all 3 ghouls out, you will be taking that tower down in no time! You can also ult yourself to take it down, but I like to save my ults for team fights. Always ult the AD carry!!!!!!!! Unless someone else has a higher AD than the carry, always ult him.