Get Blender (its freeware) and make a models of everything what u get in the game. After that u have to do some textures, use Gimp (its freeware too) or Photoshop. Or search the internet. Texture objects you have and then u finnaly can start working in Unity. After that you have all objects modeled and textured its not that hard finish your idea and make a good game. I recommend to u to go to YouTube and watch tutorials, there are hundreds of them. But I think that strategy is a little harder to start. U should first try to do really simple 3D FPS shooter, gain experiences with work in Unity and then after that make strategy game. Its a lot of scripting and variables in strategy game, maybe u should try to find some volunteers to help you. In team its everything easier.
thanks for the advices and also sorry for the late response .
yeah,i know that making a strategy game is much harder than a simple fps or side-scroller . maybe i should /and will/ try to make smaller things as you said Inkubus . i watched a few tutorials on YouTube,but in the end,i always was like meh,fuck it,because sometimes i didn’t even get the gist of what are they doing . so yeah,it would be better if i don’t need to do this alone,only problem is that i don’t know any people who are skilled in this stuffs in my country . the second part is that i don’t want to pay any on this idea,i don’t want to make money of it,i want to do this as free as i could .