New player - 1850 points list C&C needed

[mrquotes]

Hello everyone!

I'm new to 40K and decided to pick up the tyranids. 
This is my first attempt at a 1850 points list. I would like to work towards an army of this size, as it is the moest frequently played in my local gaming store. 
Here it goes:

HQ:
Hive tyrant
Wings
2x twin linked devourers with brainleech worms

Troops:

25 hormagaunts + toxin sacs

25 hormagaunts + toxin sacs

5 Warriors (4 deathspitters and 1 barbed strangler)

Elites:

3 Zoanthropes

2 Venomthropes

3 Hive guard

Fast attack: 

5 Raveners with rending claws

Heavy support:

Trygon Prime

2 Biovores

Carnifex
-Heavy venom cannon
-Spine banks

Let me know what you guys think, any advice is welcome.