someone needs to do a step-by-step on how to get the absolute best armour in the game. with descriptions on exactly what potions and enchantments and armour you need and all that.
It isn't too terribly complicated. Assuming you have maxed Smithing, Enchanting, and Alchemy:
1) Vendor purchase a Fortify Enchanting Potion. This isn't super necessary, sure, but you might as well do it.
2*) Use the Potion and then Enchant a Necklace, Ring, Helmet, and Bracer/Gauntlet with Fortify Alchemy.
3) Equip the Necklace, Ring, Helmet, and Bracer/Gauntlet you Enchanted with Fortify Alchemy. Go and make some Fortify Enchanting Potions with any two of the following ingredients: Blue Butterfly Wing, Hagraven Claw, Snowberries, Spriggan Sap. Make more than one as the duration is rather short.
4) Take your new found boosted Potion(s) and you'll basically repeat step 2. Drink the Potion, Enchant a new Necklace, Ring, Helmet, and Bracer/Gauntlet with Fortify Alchemy.
5) Repeat 3 -> 4 for awhile until you stop noticing gains (29% is the highest you'll get out of Enchanting Fortify Alchemy). Now, take one of your Fortify Enchanting Potions and make a set of Fortify Smithing equipment with a Necklace, Ring, Chest, and Bracer/Gauntlet. You'll also need to make a Fortify Smithing Potion out of two of the following ingredients: Blisterwort, Glowing Mushroom, Sabre Cat Tooth, Spriggan Sap. As before, make more than one just in case due to the duration.
6) Equip your Fortify Smithing Gear and down the Potion. Upgrade your stuff. Hooray! For the record, you only need the equipment and Potion when you're doing the upgrading of them via the Workbench or Grinding Stone; creating Armor is irrelevant to your Smithing skill.
*There's two glitches you can use here if you want. Falmer Helmet can be worn on top of Circlets and they are Enchantable so you can get five Armor slots with Fortify Alchemy Enchants. You can also select Weapon/Weapon Enchant and then swap one for one of the Armor only Enchant ... such as Fortify Alchemy. So you can also get Fortify onto your Weapons this way making for a total of 7 slots of Fortify Alchemy. If you utilize this, it is basically the same process as above except you're now also Enchanting a Falmer Helmet and two Weapons. As far as I know, they're tried and true glitches and not oversights so I'll leave it to your morals on this~
As for acquiring the two Enchants you need (Fortify Alchemy, Fortify Smithing) ... they're random. Just check Blacksmith vendors and the General Stores until you find it. If you're a Thief character, you may find it randomly on Pickpocket attempts throughout the game but I wouldn't hunt it down this way.
As for essential Perks:
Smithing - You'll need whatever Perk that is associated with your Armor. If you plan to upgrade Ebony equipment, you'll need the Ebony Smithing Perk.
Enchanting - Enchanter 5/5, Insightful Enchanter. Might as well take it all the way to Extra Effect, especially if you plan to use the glitched weapons for this procedure.
Alchemy - Alchemist 5/5, Physician, Benefactor. No real reason to go beyond this.
Other thing to note is that Armor caps at 567 so going beyond that value isn't necessary.