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This list is my first time trying to make a somewhat 'meta' list. I want to make sure it's actually a good idea before I buy the models (there are a lot of librarians). I will attach an independent character to every kill - team without a librarian. This is so I can tank with 2+ saves, but then I can also take advantage of look out sir rolls.

Librarian: 90pts
Terminator Armour
Force Axe
Divination

Dreadnaught: 100pts
Multi - melta
powerfist

WATCH COMPANY

Watch Captain: 115pts
bolt pistol
close combat weapon
artificer armour

Aquilla kill team: 265
X 9 veterans
boltgun
stalker bolter
X 1 veteran
boltgun
DW shotgun

Aquilla kill team: 338
X 9 veterans
boltgun
stalker bolter
X 1 librarian
terminator armour
force axe
divination

Aquilla kill team: 338
X 9 veterans
boltgun
stalker bolter
X 1 librarian
terminator armour
force axe
divination

Aquilla kill team : 265
X 9 veterans
boltgun
DW shotgun
X 1 black shield
lightening claws

The stratagy I have in my head is to keep two squads of the stalker bolter kill teams and the dreadnaught on the ground, then deepstrike the rest of the army to be able to do the most damage/contest objectives.

I have not play tested any deathwatch kill teams, I also have no access to the space marine psychic powers, are they good for this type of army? If so, can I get away with just buying the cards?

The stalker teams on the ground are a good start. That dreadnought loadout wants to be close in, though. Consider either a drop pod or a more long-range option. You're also going to have a real problem getting through almost any vehicles short of AV10. Try sprinkling in a few meltaguns or frag cannons.

I do like how many librarians you can get in this codex. Remember you can cast witchfires in the Psychic phase at different targets than the rest of the squad in the Shooting phase. Sometimes that kind of pseudo-splitfire will really help when you are so often going to be outnumbered.
Also remember you can Combat Squad the units that consist of only Veterans in case you need that objective grabbing capability.