It depends on which level of gear progression you are on. Anyway, i’ll show how i ussualy do it and maybe it’ll help.
Before you begin, don’t forget to look in your passive tree and skill tree first. Having a first impression on what you can pick in your tree will most likely mitigate some requirements you will need in your gear (mana, life, resistances, so on).
First, you want to set in stone which type of gear implicits you want. Choosing specific bases first will asure you don’t make impossible choices afterwards (maybe you find a got exalted boots, but then you need the cold res from the implicit so you have to change another gear and so soon).
Second, you want to set in your filter the specific shards you will need, aswell as the bases you want with said shards alredy on them. That will make sure you are hunting for what you want effectively, instead of acessing gear by gear and, again, having to make multiple changes to acomodate one great piece of gear.
Third, now that everything is setup, you want to start making your items with the apropriate affixes on the best possible slots (resists on armor, boots, gloves, helm damage on main weapon, off-hand, rings and so on). You can easily get 2 t4 and 2 t2 in the same item, so it’s not that hard to prioritize what you really need.
Lastly, keep improving on your gear, getting better tiers and eventually incorporating exalted items. Naturally, getting everything capped, having a good balance of life and damage is what you want to strive for.
Obviously, you can make changes along the way, but keep in mind, fracturing items will happen often if you are trying to make really good items, and you need to take that into consideration if you want to change gears afterwards.