I level overdrive over other skills , because this allows me to escape or chase the enemies.
This also allows me to get that movement speed without buying boots , so that I don't need to get the boots so early.

Oracle's elixir maybe bought earlier , BUT NOT LATER. I just wanted to put it there that you'll know that you should buy it sometime though.

Ultimate's passive can be tricky sometimes. It steals minion kills and also champion kills.
Also while walking in jungle it will most likely hit some monster.
I've even died while escaping in jungle , and my ultimate encountered wolves , which killed me because of my low health.

Grabbing the enemy support or carry to your carry while on lane is really useful , try to do this all the time. Also when enemies are pushing towards to your turret , try to find a spot to grab them to your turret. This will make them lose loads of health for nothing.
Using ultimate while in team fight is really useful. Do this always. The ultimate silences everyone it hits , so using this to all the enemies will make them most likely lose.
Rocket Grab + Power Fist combo is great. This stuns the enemy , pulls him to you , and also throws him in air. He cant do anything for a long time. Also using ultimate after will silence them. Your teammates will always see if your trying to grab someone. Just do it they'll come , even if they're not that close.

Blitzcrank is an awesome champion for invading the enemy jungle at beginning. You can easily grab a securing champion from a bush , or just grab the blue to your team and take it.

Start with Faerie charm + wards. Choices are : [vision ward , 2 sight wards and health potion] or [4sight wards 1health potion]

Next get philosopher's stone for some gold and mana+health regen.
Then Heart of gold for health and more gold.

Boots of mobility will give you much mobility , and used with overdrive you will catch almost any enemy champion to grab to your team.
I'd tell you to not buy any other boots.

Next get Aegis of the legion , to give you some health and resists , and also for your team.

The next item is Shurelya's reverie. Now you should remember to use the item every time that your team is either chasing something , or running away.

And keep getting those oracles elixir's now , earlier and later game to see the enemy wards or stealth'ed champions etc. Break the wards obviously.

Keep buying wards to support your team.

Exhaust and flash are the summoner spells I prefer.
Everyone knows the reason of the flash , and exhaust I have because this can easily give your carry the kill after grabbing an enemy.

Notable summoner spells :
- Ghost ; changed to flash
- Heal ; To keep you and your carry on the lane

Pros
+Pull an enemy , for an easy kill
+Awesome CC's
+Manashield
+Tanky

Cons
-Uses a lot of mana
-No heal or such spell to keep your carry on lane
-Steals farms and kills with ultimate's passive