You,ve got a good start.
The current "gold standard" for Hive Tyrant is, Wings, Twin Devourers x2 Brain Leeches, and a Thorax hive with Electro grubs for 240 points it does just about anything, and is a
Lvl 2 psyche.
The Carnifex is currently "best" with the same equip. (Twin Brain Leeches) for 150
If you run a Tervigon, I strongly suggest a Thorax hive with Electro grubs, any additional tends to end up as a poor buy. Then build a unit of Termagants x30 so you can take it as Troops.

If you get Hive Commander, you can Outflank it. That can put a lot of pressure on your foe.
Warriors are pretty dang expensive, so a very popular way to build them is two "vanilla", and one with a Cannon (I prefer the Strangle Cannon) for 100 points.
Once you get a few games in you can start filling out...Formations are very good for Nids, and both Elite and Heavy produce very good results.
I would suggest a second (and/or a third) Carnifex, and/or a Mawloc, for the Heavies.
For the Elites two Broods of Venos give exelent Shrouding, and a Brood of Zoeys seldom disappoint. If you use Forge World the Malanthrope is a much better version of the Venothrope.

I also recommend some Hormagaunts to provide a screen for the Big Bugs, I find them very useful.
Good luck! And welcome to the Hive Mind!