It is IMPORTANT that you know how much a blob will heal you, and how much you can trade with enemies. Poke is your best friend by focusing your Q on the enemy champ instead of farming with it... LEARN TO LAST HIT WITH AA, Unless your vs a ranged champ harassing you, that's the only excuse to farm with Q During Lane Phase.

Use your incredible sustain to your advantage and try to stay in lane as long as possible without putting yourself at risk (e.g. if your doing well in lane and the enemy has backed twice and has Good early items that will force you out of lane). Rush Spirit Visage, and Sunfire Cape, then your ready for mid game team fights.

As a TANK, your job is to use your kit correctly. This means Committing to your engage (within reason of course, no point fighting 1v5) Stack up on the enemy back line with a fully charged slingshot, then engage lets bounce for the ultimate CC on their back line. DO NOT ULT IF YOU CANT HIT 2 OR MORE!

You have very good Damage if you keep bouncing on the back line, while they cant do anything whilst being knocked up. Always Spam w while in ult as it is available to use, this gives bonus damage during your ult.