hi

As for cordialities, welcome to the format! First decks are always a crucible, so I shall do what I can to aid.

I will abstain from mana-base suggestions, for I don't know the deck's potential budget.

I don't have an equipment deck myself, so I shall do my best. Seeing the commander, rather than a single creature being stacked with everything on it, Syr Gwyn seems to prefer many creatures, perhaps endighted by a single equipment.

Lightning Greaves and Swiftfoot Boots are both phenomenal.

There are some cards I am unsure of.

Masterwork of Ingenuity is dependent on there being equipment on the field, so you may prefer something such as Sculpting Steel.

A card I run in my black decks is Painful Truths, which is fantastic for fastly paced decks.

Having a package of cards for each tutor is always a great plan. Seeing as that you run Open the Armory, granting the tutor utility outside of just equipment seems wise. Darksteel Mutation and Prison Term are favourites of mine, so now the tutor can be a kill spell.

Auriok Steelshaper seems like a given, and Blacklance Paragon is a fine trick. Gideon, Ally of Zendikar propels your militia of knights whilst being a lovely threat after a wrath resolves.

Now, Haakon, Stromgald Scourge is a splendid engine for the deck to have, but this means a graveyard sub-theme would be relevant. Faithless Looting may aid in card draw; Cathartic Reunion fills a same role; Entomb, Dread Return and Unburial Rites are similar to find with entomb; Buried Alive finds Haakon and some fuel for it; Cavalier of Night and Cavalier of Flame may suffice; Corpse Knight is prolific in its affliction; Dauntless Bodyguard has utility for cheap; Hero of Bladehold just gets scary far too quickly, as does Hero of Oxid Ridge; Midnight Reaper is fantastic; Marton Stromgald is selcouth to most and absolutely destructive; and Khorvath Brightflame could be quite the finisher; Worthy Knight can swarm quickly; and Ashenmoor Liege bestows power across the board.

Skullclamp and Grafted Wargear could be a fun package to run. Equip Skullclamp, then Grafted Wargear to the same creature. Attach the Wargear to another creature, the other one will die and you draw two cards, all for one mana.

For the bromidic staples; Swords to Plowshares, Path to Exile, and Despark are all great.

For an aggressive deck, as I'd assume this to be, Tymna the Weaver can draw cards abound. Alesha, Who Smiles at Death, who may not be a knight, is quite the reanimation engine. Buried Ruin to get back equipment could be a worthy inclusion.

As for your decklist, the only cards I would consider ablating are Order of Midnight, Vona, Butcher of Magan, Heirloom Blade, and Helm of the Host. Of these, Order of Midnight has the most utility. It brings something back, then can become an evasive threat to put some junk onto. Heirloom Blade just seems far too slow. Sorin, Vengeful Bloodlord is interesting. I'm not too big of a fan, but the lifelink seems relevant. Vona, Butcher of Magan doesn't actually do all of that much. She gives a deck that is attempting to swarm, equip, and maybe reanimate another hole to jump down. Now, Utter End is (in my humble opinion) an overplayed card. It's four mana to kill something Four. Sure, it's an instant, but it's four mana. I prefer Vindicate

That shall be all from me. My condolences if this sounded blunt, but I had a lot to say and I attempted to be as laconic as possible.

May fortune be with you!