Game developer for sniper game design

I want something similar to sniper3dHow much would it cost, and how long would it take? And do you develop it and design it too or I provide the graphics and animations separatelyRequirements for the I want something similar to sniper3dHow much would it cost, and how long would it take? And do you develop it and design it too or I provide the graphics and animations separatelyRequirements for the game needed:About 30 levels, starts easy and then becomes harder.About 10 WeaponsUpgrade system for the weapons (increase magazin...