Sometimes you'll have to buy fortitude before Trophy or Guardian Ward Skip Guardian Ward if you feel your shield is good enough for lane, but you'll need it later, always.
You can delay Divine Barrier and Stamina Mastery in favor of Late Game items They're upgrades to your early items so you'll buy them at the end anyways.
Support build but you can burn them to death. I could make an entire guide about how to play in lane without High-velocity rounds, but experience is a better teacher than I could ever be.