New to GK, First try at 750pt list

Greetings Brothers,
I recently started building an army of GK, this is my first attempt at forming a workable army, I've only painted and converted until now so I'm not very familiar with all the rules, so if this is breaking any codex/game rules as far as war gear etc. please let me know.

For starters i should say that this army is going to be for fun play while I'm learning all the rules/ how to play etc.
Also my primary (and probably only opponent, at least for a while ) will be Orks, both armies will be primarily footsloggers, Orks have 1 trukk and a warboss on bike but mostly just boyz and a few lootaz, burnaz, and nobz (like 5 each), I currently have no vehicles.

Ok so here is what I came up with

HQ

Ordo Xenos Inquisitor ~ Needle Pistol - Scythian Venom Talon - Psychotroke Grenades - Servo Skull

Henchman Warband

1 Warrior Acolyte ~ Storm Bolter - Power Sword - Melta Bombs - Carapace Armor
1 Warrior Acolyte ~ Storm Bolter - Power Sword - Power Armor
1 Warrior Acolyte ~ Storm Bolter - Power Sword - Power Armor
1 Warrior Acolyte ~ Storm Bolter - Carapace Armor
2 Death Cult Assassin
1 Mystic

ELITES

10 Purifiers ~ 2 Incinerators - 6 Halberds - 2 Hammers

TROOPS

5 PAGK/SS ~ 1 Psycannon - 3 Halberds - 1 Hammer

5 PAGK/SS ~ 1 Psycannon - 3 Halberds - 1 Hammer

Total ~ 751

I was thinking to start off with just the Inq. and Warband, possibly 1 SS on the table and deep strike the rest in, servo skull and mystic for scatter reduction.
Question: Does the Inq. have to join the warband or can they move independently of one another?

~ OR ~

HQ

Brotherhood Champion ~ Digital Weapons

ELITES

2 Paladins ~ Master-Crafted Halberds

10 Purifiers ~ 2 Incinerators - 6 Halberds - 2 Hammers

TROOPS

5 PAGK/SS ~ 1 Psycannon - 3 Halberds - 1 Hammer

5 PAGK/SS ~ 1 Psycannon - 3 Halberds - 1 Hammer

Total ~ 752

The BroChamp would be joining the paladins or purifiers, probably paladins though


I also have these to switch with anything above
1 GM/Lib (only have 1 model to use at the moment, so its one or the other)(GM can share heavy weapons with GKT)(magnets )
5 GKT with magnetized heavy weapons(2 of which are the paladins in list 2)
2 Purifiers with Incinerators
3 PAGK with Psycannons

Any and All advice, opinions, suggestions and constructive criticism are welcomed and appreciated
Thank you in advance

~Brother Disciple~