Hey there, I'm another noob that has an idea for a chapter/army list (have been wanting to get into 40k but am searching for the army that feels right). I'd appreciate any feedback, unit sizes/gearing/bad combinations ect. that those who've played a few rounds would have.
Chapter: Snow Harriers. A divergent ultramarine chapter. Fluff is basically they were always heavy on apothecary's, but since their forming they've taken it to the extreme... so far as to believe their gene-seed is more important to preserve then all other chapters (fairly self righteous group, who disdains CC).
Traits: Purity above all
uphold the honor of the emperor
Disadvantages: Eye to Eye
We stand alone (cause we're cocky jerks

)
HQ: Master: storm bolter, power fist, auspex
9 marine HQ, Apothecary, 2 plasma guns
Tactical squad 1: 9 marines, sarge upgraded to apothecary, term. honours (pwr fist and stormbolter), lascannon.
Tactical squad 2: 9 marines, sarge upgraded to apothecary, term. Honours (power fist and stormbolter), heavy bolter.
Devastators: 4 marines, 4 missile launchers, 1 sarge with bolter.
Veteran squad 1: 8 veterans, sarge (upgraded to apothecary), term honors, power fist/stormbolter, heavy bolter and plasma gun. infiltrate for skill
Veteran squad 2: 8 veterans, sarge (upgraded to apothecary), term honors, power fist/stormbolter, plasma gun and multi-melta. Infiltrate for skill.
1x predator annihilator, heavy bolter sponsons.
1x rhino, smoke launchers.
Alrighty, that was a 1500 point go. As I understand the rules it makes sense, please clue me in on any combinations that are bad. I took the 2 vets because the apothecary upgrade with the purity trait can be taken by them, and because they can get the save from the other trait. Thanks for reading!!