Also, on your first B make sure you have enough to complete your Tear as well as get a ward. Most junglers will avoid bottom unless its really pushed because the support always has it warded. Mid is harder to gank usually, and top vs yorick is a tough lane. Therefore, expect a good deal of jungler attention...
You don't have to push the lane. Your ghouls only attack the enemy champ and your E is targeted. Most tend to boost E first, so your AoE W deals minimal damage to creeps and enemies, but the slow is invaluable for ensuring that they eat a lot of ghoul damage.
I try to keep the creeps close to my tower so I can zone the enemy once Ive gotten a decent advantage. I find this to be effective at hozing the enemy while minimizing my jungler vulnerability.
After getting the ward and tear you have more room to spam, so you can more safely push to their tower if desired.