Yo I'm xTimekeepeRx. Gyrocopter is one of my favourite hero. He shoots bullets and doesn't afraid of anything.
Stout Shield is essential for damage block as gyro has low hp.
Iron Branch for gg.
Tango for regen if you getting harassed alot.
Poor Man's Shield for more armour with +6 agi.
Tranquil Boots to help stay in lane longer.
Shadow Blade should be up before 15 minutes to help you start ganking earlier.
Aghanim's Scepter for more hyper dmg and global.
Radiance for more damage while you are invisible from Shadow Blade.
Flak Cannon so that you can farm and harass at the same time. Stats will help you become tank and dmg.
Call Down obvious reasons.
Homing Missile is useless, but get 1 to distract people from aiming you.
Rocket Barrage useless since you going for auto attack style.
Before a fight, on your Flak Cannon + Shadow Blade, go into middle of enemies, burn them with Radiance for 5s before coming out and shooting them.
Use Call Down behind them to prevent them from running away and force them to fight you like a man.
Wait for your Flak Cannon to almost cooldown before appearing from invi so that you can Flak Cannon again for more AoE dmg.
Keeping Rocket Barrage at lvl 1 will make others think twice before rushing you as they don't know if you maxed it or not.