Your goal is to farm up your Q for atleast 100 bonus demage and push push push. Swich lanes and just push provide money for your team by doing turrets. After you get The BloodThirster start doing Dragon solo. Allways be prepared for a gank cus you will be very wanted dead by the enemy team and think of a way out remember you can slow em rly much plus you have frozen mallet which can slow on hit. Use your Ghostblade to nuke turrets or run away 20%MS is preety damn much. Late game you can join your team m8s in team fights after atleast 6 turrets are down(they are worth destroying cus they give 150 each multiple that by 6 and then by 5 youll get 4500 for the whole team 900 each player thats 1 item in advance) But still i would recommend further pushing. Destroying the Inhibitors is very easy since youre a pusher it goes down in abt 5 secs. USE YOUR TELEPORT AND SWICH LANES AS MUCH AS YOU CAN. AVOID KS AND GETTING KILLED!!! Do the Dragon as much as you can. Blue is very good for you cus it gives 20% CDR plus the enormus mana regen which is VERY helpfull for farming Q.
Mid and late game 1v1 will be easy like fuuuuu*k cus youll have 40% life steal. Soloing Baron is very possible ive done it in 27th min with around 200 Q farmed a BT TF and boots.
This is preety much it just FARM AND PUSH (Its a bit boring but win is nearly allways asured)

BTW Manamunes bonus mana and demage aint included. You will have 3000 Mana and 360 Damage Total