Well, we might dont be Maiet but GunZ was designed for Low Poly Models
so even ppl with old PC can play it.
And Gunz still is a Low Poly based game.
I wont teach you, because i dont see what i should teach you, besides, tbh im a bad teacher ;>
1k is kind of fine with me, its not uber big, but it could be a bit smaller.

All i can tell you is to use 8 Vert Circles instead of 32 Vert Circles.
You also dont have to model every little crack and stuff like that.