First thing you should do is to Explore for the acres.<br />
You can do this by hover the mouse on the top menu [City & Robot] -> [Expand City].
Then start your exploration. In the beginning, you will have 1800 Acres and you can explore for more. The more acres you got the better, as it will increase your Credits earning, also you can refill HP/EN of your mecha faster, as well as a few more benefits.<br />
Acres you got from exploring will be Free Acres which is still not put into any use. Therefore, after you explore and increase your Acres to the amount you want, you must allocate your free Acres to the facilities you want. Hover your mouse on the top menu [City & Robot] -> [Manage City], which will looks like the picture below.<br />