Playing Melee Abrams in early lane can be quite punishing especially if you get parried. Try to gain early soul advantage by farming enemy minions with gun using close quarters and melee to confirm souls so enemy heroes can't take soul orbs, and punishing overextended heroes with shoulder charge.10 items
Some early options if your high on souls and monster rounds if enemy is playing offensive to make it easier to take minions2 items
Mid Game
This is when you wanna farm up and at least get lifestrike (1st) and crushing fists (2nd) and also when Melee Abrams starts becoming strong, get either Battle Vest or Enchanter's Emblem depending on what the enemy has bought into also use gun at close range 11 items